A two million year record of low-latitude aridity linked to continental weathering from the Maldives

doi:10.1186/s40645-018-0238-x

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	A two million year record of low-latitude aridity linked to continental weathering from the Maldives
	Swart, Peter K.; Wright, James D.; Yao, Zhengquan 22; Young, Jeremy R.; Lindhorst, Sebastian ; Stainbank, Stephanie 24; Rueggeberg, Andres 24; Spezzaferri, Silvia 24; Carrasqueira, Igor 9; Hu, Siyao 18
刊名	PROGRESS IN EARTH AND PLANETARY SCIENCE
	2018
卷号	5
关键词	Maldives IODP Exp 359 Non-destructive core scanning Composition of lithogenic fraction Orbital cycles Indian-Asian history of aridity Mid Pleistocene transition
ISSN号	2197-4284
DOI	10.1186/s40645-018-0238-x
英文摘要	Indian-Asian monsoon has oscillated between warm/wet interglacial periods and cool/dry glacial periods with periodicities closely linked to variations in Earth's orbital parameters. However, processes that control wet versus dry, i.e. aridity cyclical periods on the orbital time-scale in the low latitudes of the Indian-Asian continent remain poorly understood because records over millions of years are scarce. The sedimentary record from International Ocean Discovery Program (IODP) Expedition 359 provides a well-preserved, high-resolution, continuous archive of lithogenic input from the Maldives reflecting on low-latitude aridity cycles. Variability within the lithogenic component of sedimentary deposits of the Maldives results from changes in monsoon-controlled sedimentary sources. Here, we present X-ray fluorescence (XRF) core-scanning results from IODP Site U1467 for the past two million years, allowing full investigation of orbital periodicities. We specifically use the Fe/K as a terrestrial climate proxy reflecting on wet versus dry conditions in the source areas of the Indian-Asian landmass, or from further afield. The Fe/K record shows orbitally forced cycles reflecting on changes in the relative importance of aeolian (stronger winter monsoon) during glacial periods versus fluvial supply (stronger summer monsoon) during interglacial periods. For our chronology, we tuned the Fe/Kcycles to precessional insolation changes, linking Fe/K maxima/minima to insolation minima/maxima with zero phase lag. Wavelet and spectral analyses of the Fe/K record show increased dominance of the 100kyr cycles after the Mid Pleistocene Transition (MPT) at 1.25Ma in tandem with the global ice volume benthic O-18 data (LR04 record). In contrast to the LR04 record, the Fe/K profile resolves 100-kyr-like cycles around the 130kyr frequency band in the interval from 1.25 to 2 million years. These 100-kyr-like cycles likely form by bundling of two or three obliquity cycles, indicating that low-latitude Indian-Asian climate variability reflects on increased tilt sensitivity to regional eccentricity insolation changes (pacing tilt cycles) prior to the MPT. The implication of appearance of the 100kyr cycles in the LR04 and the Fe/K records since the MPT suggests strengthening of a climate link between the low and high latitudes during this period of climate transition.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17659]
专题	南海海洋研究所_中科院边缘海地质重点实验室
作者单位	1.IPMA, Div Geol Georecursos Marinhos, Rua Alfredo Magalhaes Ramalhoi 6, P-1495006 Lisbon, Portugal 2.Blattler, Clara L.] Princeton Univ, Dept Geosci, Guyot Hall, Princeton, NJ 08544 USA 3.Bialik, Or M.] Univ Haifa, Dr Moses Strauss Dept Marine Geosci, Leon H Charney Sch Marine Sci, IL-31905 Haifa, Israel 4.Eberli, Gregor P.; Mee, Anna Ling Hui; Swart, Peter K.] Univ Miami, Sch Marine & Atmospher Sci, Dept Marine Geosci, Miami, FL 33149 USA 5.Univ Hamburg, Inst Geol, CFN, Bundesstr 55, D-20146 Hamburg, Germany 6.Univ Edinburgh, Grant Inst, Sch GeoSci, Kings Bldg,West Mains Rd, Edinburgh EH9 3JW, Midlothian, Scotland 7.Univ Lorraine, Ecole Natl Super Geol, 2 Rue Doyen Marcel Roubault, F-54501 Vandoeuvre Les Nancy, France 8.Korea Inst Geosci & Mineral Resoursces KIGAM, Petr & Marine Res Div, Gwahang 124, Daejeon 305350, South Korea 9.Okayama Univ, Grad Sch Nat Sci & Technol, 3-1-1 Tsushima Naka, Okayama 7008530, Japan 10.Univ Sao Paulo, Inst Oceanog, Praca Oceanog 191, BR-05508120 Sao Paulo, SP, Brazil
推荐引用方式 GB/T 7714	Swart, Peter K.,Wright, James D.,Yao, Zhengquan,et al. A two million year record of low-latitude aridity linked to continental weathering from the Maldives[J]. PROGRESS IN EARTH AND PLANETARY SCIENCE,2018,5.
APA	Swart, Peter K..,Wright, James D..,Yao, Zhengquan.,Young, Jeremy R..,Lindhorst, Sebastian.,...&Su, Xiang.(2018).A two million year record of low-latitude aridity linked to continental weathering from the Maldives.PROGRESS IN EARTH AND PLANETARY SCIENCE,5.
MLA	Swart, Peter K.,et al."A two million year record of low-latitude aridity linked to continental weathering from the Maldives".PROGRESS IN EARTH AND PLANETARY SCIENCE 5(2018).