气候变化领域集成服务门户(CCPortal): Paleocene to Pliocene low-latitude, high-elevation basins of southern Tibet: Implications for tectonic models of India-Asia collision, Cenozoic climate, and geochemical weathering

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DOI	10.1130/B31723.1
	Paleocene to Pliocene low-latitude, high-elevation basins of southern Tibet: Implications for tectonic models of India-Asia collision, Cenozoic climate, and geochemical weathering
	Ingalls, Miquela; Rowley, David; Olack, Gerard; Currie, Brian; Li, Shanying; Schmidt, Jennifer; Tremblay, Marissa; Polissar, Pratigya; Shuster, David L.; Lin, Ding; Colman, Albert
通讯作者	Ingalls, M (通讯作者)
发表日期	2018
ISSN	0016-7606
EISSN	1943-2674
起始页码	307
结束页码	330
卷号	130 期号:1-2
英文摘要	The elevation history of the Tibetan Plateau promises insight into the mechanisms and dynamics that develop and sustain high topography over tens of millions of years. We present the first nearly continuous Cenozoic elevation history from two sedimentary basins on the southern Tibetan Plateau within the latest Cretaceous to Eocene Gangdese arc. Oxygen-isotope and Delta(47) clumped-isotope compositions of nonmarine carbonates allow us to constrain carbonate formation temperature and reconstruct the paleoprecipitation record of the Eocene to Pliocene Oiyug Basin and Paleocene to Eocene Penbo Basin. We exploit the systematic decrease of surface temperature and meteoric water delta O-18 values with elevation to derive paleoelevation estimates for these basins. Minimally altered and unaltered pedogenic and lacustrine carbonates from the Oiyug Basin yield Delta(47,) (CDES) (relative to the carbon dioxide equilibrium scale [CDES]) values of 0.625% to 0.755%, which correspond to temperatures of 1-30 degrees C using a Delta(47) thermometer for low-temperature carbonates. Similarly, the Penbo Basin yielded Delta(47), CDES values of 0.701% to 0.726%, corresponding to temperatures of 6-12 degrees C. The apparent evidence for survival of primary clumped-isotope values in the face of substantial burial and heating is an important result for the field of carbonate clumped-isotope thermometry. Our paleoelevation estimates for the Eocene to Pliocene Oiyug Basin (similar to 6.5-4.1 km) support previous evidence that high elevations were attained in southern Tibet by at least ca. 30 Ma. Stable-isotope results allow for the possibility of significant topographic subsidence during the Miocene as a result of regional extension. In the Penbo Basin, our paleoelevation estimates for the Paleocene to Eocene Nianbo Formation (4.4 + 1.3/-1.7 km) and Eocene Pana Formation (4.1 + 1.2/-1.6 km) extend the altitude record of the southern Tibetan Plateau to pre-India-Asia collision. These results support the Lhasaplano model of an Andean-type continental margin tectonic system. The rise of the Himalayas and Tibet is often invoked to understand isotopic proxies for global chemical weathering in the Cenozoic and has constrained the debate on the nature of CO2-climate-weathering feedbacks. The nature of the Tibetan paleoelevations from pre- to postcollision, as presented here, indicates that high relief at low latitude prevailed on the Asian margin much earlier than previously thought. Thus, high topography alone at low latitude is not sufficient to account for the Cenozoic weathering proxy record.
关键词	CLUMPED ISOTOPE GEOTHERMOMETER SOIL CARBONATE FORMATION LATE MIOCENE PALEOSOL CARBONATE C-13-O-18 BONDS STABLE-ISOTOPES OIYUG BASIN PLATEAU UPLIFT PALEOELEVATION
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000418364200016
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259353
推荐引用方式 GB/T 7714	Ingalls, Miquela,Rowley, David,Olack, Gerard,et al. Paleocene to Pliocene low-latitude, high-elevation basins of southern Tibet: Implications for tectonic models of India-Asia collision, Cenozoic climate, and geochemical weathering[J]. 中国科学院青藏高原研究所,2018,130(1-2).
APA	Ingalls, Miquela.,Rowley, David.,Olack, Gerard.,Currie, Brian.,Li, Shanying.,...&Colman, Albert.(2018).Paleocene to Pliocene low-latitude, high-elevation basins of southern Tibet: Implications for tectonic models of India-Asia collision, Cenozoic climate, and geochemical weathering.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130(1-2).
MLA	Ingalls, Miquela,et al."Paleocene to Pliocene low-latitude, high-elevation basins of southern Tibet: Implications for tectonic models of India-Asia collision, Cenozoic climate, and geochemical weathering".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130.1-2(2018).