Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin
Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies reco...
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Gespeichert in:
| Autor*in: |
Hu, Xiumian [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2006 |
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| Schlagwörter: |
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| Anmerkung: |
© Science in China Press 2006 |
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| Übergeordnetes Werk: |
Enthalten in: Science in China / D - Science in China Press, 1996, 49(2006), 8 vom: Aug., Seite 785-795 |
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| Übergeordnetes Werk: |
volume:49 ; year:2006 ; number:8 ; month:08 ; pages:785-795 |
| Links: |
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| DOI / URN: |
10.1007/s11430-006-0785-7 |
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OLC2063780080 |
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| 245 | 1 | 0 | |a Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin |
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| 520 | |a Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. | ||
| 650 | 4 | |a oceanic red beds | |
| 650 | 4 | |a Upper Cretaceous | |
| 650 | 4 | |a lithofacies | |
| 650 | 4 | |a sedimentary environment | |
| 650 | 4 | |a red colour | |
| 650 | 4 | |a southern Tibet | |
| 700 | 1 | |a Wang, Chengshan |4 aut | |
| 700 | 1 | |a Li, Xianghui |4 aut | |
| 700 | 1 | |a Jansa, Luba |4 aut | |
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10.1007/s11430-006-0785-7 doi (DE-627)OLC2063780080 (DE-He213)s11430-006-0785-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 13 ssgn Hu, Xiumian verfasserin aut Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2006 Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. oceanic red beds Upper Cretaceous lithofacies sedimentary environment red colour southern Tibet Wang, Chengshan aut Li, Xianghui aut Jansa, Luba aut Enthalten in Science in China / D Science in China Press, 1996 49(2006), 8 vom: Aug., Seite 785-795 (DE-627)193118238 (DE-600)1307899-9 (DE-576)062316923 1006-9313 nnns volume:49 year:2006 number:8 month:08 pages:785-795 https://doi.org/10.1007/s11430-006-0785-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-OAS SSG-OLC-MFO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 GBV_ILN_4082 AR 49 2006 8 08 785-795 |
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10.1007/s11430-006-0785-7 doi (DE-627)OLC2063780080 (DE-He213)s11430-006-0785-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 13 ssgn Hu, Xiumian verfasserin aut Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2006 Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. oceanic red beds Upper Cretaceous lithofacies sedimentary environment red colour southern Tibet Wang, Chengshan aut Li, Xianghui aut Jansa, Luba aut Enthalten in Science in China / D Science in China Press, 1996 49(2006), 8 vom: Aug., Seite 785-795 (DE-627)193118238 (DE-600)1307899-9 (DE-576)062316923 1006-9313 nnns volume:49 year:2006 number:8 month:08 pages:785-795 https://doi.org/10.1007/s11430-006-0785-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-OAS SSG-OLC-MFO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 GBV_ILN_4082 AR 49 2006 8 08 785-795 |
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10.1007/s11430-006-0785-7 doi (DE-627)OLC2063780080 (DE-He213)s11430-006-0785-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 13 ssgn Hu, Xiumian verfasserin aut Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2006 Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. oceanic red beds Upper Cretaceous lithofacies sedimentary environment red colour southern Tibet Wang, Chengshan aut Li, Xianghui aut Jansa, Luba aut Enthalten in Science in China / D Science in China Press, 1996 49(2006), 8 vom: Aug., Seite 785-795 (DE-627)193118238 (DE-600)1307899-9 (DE-576)062316923 1006-9313 nnns volume:49 year:2006 number:8 month:08 pages:785-795 https://doi.org/10.1007/s11430-006-0785-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-OAS SSG-OLC-MFO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 GBV_ILN_4082 AR 49 2006 8 08 785-795 |
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10.1007/s11430-006-0785-7 doi (DE-627)OLC2063780080 (DE-He213)s11430-006-0785-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 13 ssgn Hu, Xiumian verfasserin aut Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2006 Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. oceanic red beds Upper Cretaceous lithofacies sedimentary environment red colour southern Tibet Wang, Chengshan aut Li, Xianghui aut Jansa, Luba aut Enthalten in Science in China / D Science in China Press, 1996 49(2006), 8 vom: Aug., Seite 785-795 (DE-627)193118238 (DE-600)1307899-9 (DE-576)062316923 1006-9313 nnns volume:49 year:2006 number:8 month:08 pages:785-795 https://doi.org/10.1007/s11430-006-0785-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-OAS SSG-OLC-MFO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 GBV_ILN_4082 AR 49 2006 8 08 785-795 |
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10.1007/s11430-006-0785-7 doi (DE-627)OLC2063780080 (DE-He213)s11430-006-0785-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 13 ssgn Hu, Xiumian verfasserin aut Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2006 Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. oceanic red beds Upper Cretaceous lithofacies sedimentary environment red colour southern Tibet Wang, Chengshan aut Li, Xianghui aut Jansa, Luba aut Enthalten in Science in China / D Science in China Press, 1996 49(2006), 8 vom: Aug., Seite 785-795 (DE-627)193118238 (DE-600)1307899-9 (DE-576)062316923 1006-9313 nnns volume:49 year:2006 number:8 month:08 pages:785-795 https://doi.org/10.1007/s11430-006-0785-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-OAS SSG-OLC-MFO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 GBV_ILN_4082 AR 49 2006 8 08 785-795 |
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The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. 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upper cretaceous oceanic red beds in southern tibet: lithofacies, environments and colour origin |
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Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin |
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Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. © Science in China Press 2006 |
| abstractGer |
Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. © Science in China Press 2006 |
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Abstract Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales. The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high $ Fe_{2} $$ O_{3} $, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget. © Science in China Press 2006 |
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