Land mammal geochronology and magnetostratigraphy of mid-Tertiary deposits in the Lanzhou Basin, Gansu Province, China

IVPP-IR > 中科院古脊椎所（2000年以后）

	Land mammal geochronology and magnetostratigraphy of mid-Tertiary deposits in the Lanzhou Basin, Gansu Province, China
	Qiu, ZX; Wang, BY ; Qiu, ZD ; Heller, F ; Yue, LP ; Xie, GP ; Wang, XM ; Engesser, B ; Qiu, ZX (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
	2001
发表期刊	ECLOGAE GEOLOGICAE HELVETIAE
ISSN	0012-9402
卷号	94 期号:3 页码:373-385
文章类型	Article
摘要	The Lanzhou Basin is situated at the northeast slopes of the Tibetan Plateau, and its basin-fill is expected to reflect the process of uplifting of the plateau like the Siwaliks south to the Himalayas. The more than 1000 in thick Cenozoic part of the continental deposits of the basin is composed by the Xiliugou, Yehucheng and Xianshuihe Formations. They form a syncline, the axis of which stretches in SSE-NNW direction in the eastern part of the basin. The Xiansbuihe Formation, which contains a rich mammalian fauna, is well dated paleontologically. More than 600 paleomagnetic samples were collected for magnetostratigraphic analysis in the Dahonggou and Xiajie sections in the western part of the basin at a mean sampling interval of 2.2 m. The polarity column which was derived from the stable part of the natural remanent magnetization of the rocks, is well defined in most parts. It contains some apparent polarity characteristics which can be linked closely to the geomagnetic polarity time scale taking paleontological key points into account. The polarity zones of the Xianshuihe Formation seem to correspond in great detail to chrons C12r - C5A with the bottom boundary of the formation placed at 31 Ma and its top around 15 Ma. The 10 normal-reversed polarity zones of the underlying Yehucheng Formation are interpreted to approach chron C22 at about 51 Ma towards the older end. This interpretation is hampered, however, by a very fragmentary fossil record and evident hiatuses. Using the paleontologic-magnetostratigraphic time frame, several obvious changes in the sedimentation environment can be recognized in the Lanzhou Basin. Their timing and character are related to the uplift of the Tibetan plateau which took place mainly after deposition of the Lanzhou red beds in the late Pliocene.; The Lanzhou Basin is situated at the northeast slopes of the Tibetan Plateau, and its basin-fill is expected to reflect the process of uplifting of the plateau like the Siwaliks south to the Himalayas. The more than 1000 in thick Cenozoic part of the continental deposits of the basin is composed by the Xiliugou, Yehucheng and Xianshuihe Formations. They form a syncline, the axis of which stretches in SSE-NNW direction in the eastern part of the basin. The Xiansbuihe Formation, which contains a rich mammalian fauna, is well dated paleontologically. More than 600 paleomagnetic samples were collected for magnetostratigraphic analysis in the Dahonggou and Xiajie sections in the western part of the basin at a mean sampling interval of 2.2 m. The polarity column which was derived from the stable part of the natural remanent magnetization of the rocks, is well defined in most parts. It contains some apparent polarity characteristics which can be linked closely to the geomagnetic polarity time scale taking paleontological key points into account. The polarity zones of the Xianshuihe Formation seem to correspond in great detail to chrons C12r - C5A with the bottom boundary of the formation placed at 31 Ma and its top around 15 Ma. The 10 normal-reversed polarity zones of the underlying Yehucheng Formation are interpreted to approach chron C22 at about 51 Ma towards the older end. This interpretation is hampered, however, by a very fragmentary fossil record and evident hiatuses. Using the paleontologic-magnetostratigraphic time frame, several obvious changes in the sedimentation environment can be recognized in the Lanzhou Basin. Their timing and character are related to the uplift of the Tibetan plateau which took place mainly after deposition of the Lanzhou red beds in the late Pliocene.
关键词	Paleontology Mammals Magnetostratigraphy Tectonic Uplift Tibetan Plateau
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	NORTHERN
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000174180000009
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3889
专题	中科院古脊椎所（2000年以后）古哺乳动物研究室
通讯作者	Qiu, ZX (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 2.ETH Honggerberg, Inst Geophys, CH-8093 Zurich, Switzerland 3.NW Univ Xian, Dept Geol, Xian 710069, Peoples R China 4.Gansu Prov Museum, Lanzhou 730050, Gansu Province, Peoples R China 5.Long Isl Univ, Dept Biol, Greenvale, NY 11548 USA 6.Amer Museum Nat Hist, Dept Vertebrate Paleontol, New York, NY 10024 USA 7.Nat Hist Museum, Osteol Abt, CH-4001 Basel, Switzerland
推荐引用方式 GB/T 7714	Qiu, ZX,Wang, BY,Qiu, ZD,et al. Land mammal geochronology and magnetostratigraphy of mid-Tertiary deposits in the Lanzhou Basin, Gansu Province, China[J]. ECLOGAE GEOLOGICAE HELVETIAE,2001,94(3):373-385.
APA	Qiu, ZX.,Wang, BY.,Qiu, ZD.,Heller, F.,Yue, LP.,...&Qiu, ZX .(2001).Land mammal geochronology and magnetostratigraphy of mid-Tertiary deposits in the Lanzhou Basin, Gansu Province, China.ECLOGAE GEOLOGICAE HELVETIAE,94(3),373-385.
MLA	Qiu, ZX,et al."Land mammal geochronology and magnetostratigraphy of mid-Tertiary deposits in the Lanzhou Basin, Gansu Province, China".ECLOGAE GEOLOGICAE HELVETIAE 94.3(2001):373-385.