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| Miocene C(4)Grassland Expansion as Recorded by the Indus Fan | |
Feakins, Sarah J.; Liddy, Hannah M.; Tauxe, Lisa1; Galy, Valier2; Feng, Xiaojuan3 ; Tierney, Jessica E.; Miao, Yunfa5,6,7,8; Warny, Sophie9,10
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| 2020 | |
| Source Publication | PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
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| ISSN | 2572-4517 |
| Volume | 35Issue:6 |
| Abstract | 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. |
| Keyword | International Ocean Discovery Program Expedition 355 Site U1457 Indus Fan biomarker |
| Subject Area | Geosciences, Multidisciplinary ; Oceanography ; Paleontology |
| DOI | 10.1029/2020PA003856 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | C-4 PLANT EXPANSION ; VEGETATION CHANGE ; ATMOSPHERIC CO2 ; ARABIAN SEA ; ISOTOPIC COMPOSITION ; LATE QUATERNARY ; WAX BIOMARKERS ; CLAY-MINERALS ; RIVER-BASIN ; EVOLUTION |
| WOS Research Area | Geology ; Oceanography ; Paleontology |
| WOS ID | WOS:000545646500002 |
| Publisher | AMER GEOPHYSICAL UNION |
| Subtype | Article |
| Publication Place | WASHINGTON |
| EISSN | 2572-4525 |
| Funding Organization | 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] |
| Corresponding Author Email | feakins@usc.edu |
| OA | Green Published, Bronze |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ibcas.ac.cn/handle/2S10CLM1/21697 |
| Collection | 植被与环境变化国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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). |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Feakins-2020-Miocene（1725KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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