气候变化领域集成服务门户(CCPortal): Whole-rock 40Ar/39Ar geochronology, geochemistry, and stratigraphy of intraplate Cenozoic volcanic rocks, central Mongolia

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DOI	10.1130/B31788.1
	Whole-rock 40Ar/39Ar geochronology, geochemistry, and stratigraphy of intraplate Cenozoic volcanic rocks, central Mongolia
	Ancuta L.D.; Zeitler P.K.; Idleman B.D.; Jordan B.T.
发表日期	2018
ISSN	167606
起始页码	1397
结束页码	1408
卷号	130 期号:2021-07-08
英文摘要	A new comprehensive suite of 235 wholerock 40Ar/39Ar ages ranges from Holocene to ca. 30 Ma for Cenozoic volcanic rocks in central Mongolia. Their total preserved volume is ~1540 km3, but prior to erosion, the volume may have been as high as 2900 km3. The 235 new stratigraphically referenced ages, combined with surface mapping, suggest that volcanic output began to increase in the early Miocene and peaked in the middle Miocene, with a gradual decrease in volume through the Holocene. Trace-element inversion modeling suggests that the volcanic rocks were derived by low degrees of partial melting of a garnet lherzolite source at a depth greater than 62 km. The low total volumes and the lack of an apparent age-progressive hotspot track suggest that the volcanism cannot be attributed to a deep mantle plume beneath central Mongolia. The long-term gradual increase and subsequent decrease in volcanic output may also rule out delamination as the cause of the volcanism. Instead, we favor a small-scale mantle upwelling to explain the cause of the intraplate volcanism in the region. This upwelling could have been the result of one or more different processes, including edge-driven convection, redirection of asthenospheric flow by the thick lithosphere of the Siberian craton to the north, shear-driven upwelling, delamination, drips, or upwelling related to stagnant slabs in the mantle transition zone. © 2018 The Authors.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185008
作者单位	Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, United States; Department of Sustainability and Environment, University of South Dakota, Vermillion, SD 57069, United States
推荐引用方式 GB/T 7714	Ancuta L.D.,Zeitler P.K.,Idleman B.D.,et al. Whole-rock 40Ar/39Ar geochronology, geochemistry, and stratigraphy of intraplate Cenozoic volcanic rocks, central Mongolia[J],2018,130(2021-07-08).
APA	Ancuta L.D.,Zeitler P.K.,Idleman B.D.,&Jordan B.T..(2018).Whole-rock 40Ar/39Ar geochronology, geochemistry, and stratigraphy of intraplate Cenozoic volcanic rocks, central Mongolia.Bulletin of the Geological Society of America,130(2021-07-08).
MLA	Ancuta L.D.,et al."Whole-rock 40Ar/39Ar geochronology, geochemistry, and stratigraphy of intraplate Cenozoic volcanic rocks, central Mongolia".Bulletin of the Geological Society of America 130.2021-07-08(2018).