Miocene C(4)Grassland Expansion as Recorded by the Indus Fan

doi:10.1029/2020PA003856

	Miocene C(4)Grassland Expansion as Recorded by the Indus Fan
	Feakins, Sarah J.; Liddy, Hannah M.; Tauxe, Lisa 1; Galy, Valier 2; Feng, Xiaojuan3 ; Tierney, Jessica E.; Miao, Yunfa 5,6,7,8; Warny, Sophie 9,10
	2020
发表期刊	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
ISSN	2572-4517
卷号	35 期号:6
摘要	In the late Miocene, grasslands spread across the forested floodplains of the Himalayan foreland, but the causes of the ecological transition are still debated. Recent seafloor drilling by the International Ocean Discovery Program (IODP) provides an opportunity to study the transition across a larger region as archived in the Indus submarine fan. We present a multiproxy study of past vegetation change based on analyses of the carbon isotopic composition (delta C-13) of bulk organic carbon, plant waxn-alkanes andn-alkanoic acids, and quantification of lignin phenols, charcoal, and pollen. We analyze the hydrogen isotopic composition (delta D) of plant wax to reconstruct precipitation delta D. We use the Branched and Isoprenoid Tetraether (BIT) index to diagnose shifts between terrestrial versus marine lipid inputs between turbidite and hemipelagic sediments. We reconstruct ocean temperatures using the TEX(86)index only where marine lipids dominate. We find evidence for the late Miocene grassland expansion in both facies, confirming this was a regional ecosystem transformation. Turbidites contain dominantly terrestrial matter from the Indus catchment (D-depleted plant wax), delivered via fluvial transport as shown by the presence of lignin. In contrast, hemipelagic sediments lack lignin and bear D-enriched plant wax consistent with wind-blown inputs from the Indian peninsula; these show a 7.4-7.2 Ma expansion of C(4)grasslands on the Indian subcontinent. Within each facies, we find no clear change in delta D values across the late Miocene C(4)expansion, implying consistent distillation of rainfall by monsoon dynamics. Yet, a cooling in the Arabian Sea is coincident with the C(4)expansion.
关键词	International Ocean Discovery Program Expedition 355 Site U1457 Indus Fan biomarker
学科领域	Geosciences, Multidisciplinary ; Oceanography ; Paleontology
DOI	10.1029/2020PA003856
收录类别	SCI
语种	英语
WOS关键词	C-4 PLANT EXPANSION ; VEGETATION CHANGE ; ATMOSPHERIC CO2 ; ARABIAN SEA ; ISOTOPIC COMPOSITION ; LATE QUATERNARY ; WAX BIOMARKERS ; CLAY-MINERALS ; RIVER-BASIN ; EVOLUTION
WOS研究方向	Geology ; Oceanography ; Paleontology
WOS记录号	WOS:000545646500002
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	2572-4525
资助机构	U.S. National Science FoundationNational Science Foundation (NSF) [OCE 14-50528, GG0093093-01, EAR 1547263] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41772181]
作者邮箱	feakins@usc.edu
作品OA属性	Green Published, Bronze
引用统计	被引频次：33[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21697
专题	植被与环境变化国家重点实验室
作者单位	1.[Feakins, Sarah J.; Liddy, Hannah M.] Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90007 USA 2.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 90007 USA 3.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 92103 USA 4.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA 5.Tierney, Jessica E.] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 6.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA 7.Chinese Acad Sci, Northwest Inst Eco Environm & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China 8.Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 9.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China 10.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA USA 11.Louisiana State Univ, Museum Nat Sci, Baton Rouge, LA 70803 USA
推荐引用方式 GB/T 7714	Feakins, Sarah J.,Liddy, Hannah M.,Tauxe, Lisa,et al. Miocene C(4)Grassland Expansion as Recorded by the Indus Fan[J]. PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,2020,35(6).
APA	Feakins, Sarah J..,Liddy, Hannah M..,Tauxe, Lisa.,Galy, Valier.,Feng, Xiaojuan.,...&Warny, Sophie.(2020).Miocene C(4)Grassland Expansion as Recorded by the Indus Fan.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,35(6).
MLA	Feakins, Sarah J.,et al."Miocene C(4)Grassland Expansion as Recorded by the Indus Fan".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 35.6(2020).

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