气候变化领域集成服务门户(CCPortal): Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula, and correlations along the Gondwana margin

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DOI	10.1130/B31800.1
	Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula, and correlations along the Gondwana margin
	Riley T.R.; Burton-Johnson A.; Flowerdew M.J.; Whitehouse M.J.
发表日期	2018
ISSN	167606
起始页码	1177
结束页码	1196
卷号	130 期号:2021-07-08
英文摘要	Long-lived continental margin arcs are characterized by episodes of large-volume magmatism (or flare-ups) that can persist for ~30 m.y. before steady-state arc conditions resume. Flare-up events are characterized by the emplacement of large-volume granodiorite- tonalite batholiths and sometimes associated rhyodacitic ignimbrites. One of the major flare-up events of the West Gondwana margin occurred during the mid-Cretaceous and was temporally and spatially associated with widespread deformation and Pacific plate reorganization. New U-Pb geochronology from the Lassiter Coast intrusive suite in the southern Antarctic Peninsula identifies a major magmatic event in the interval 130-102 Ma that was characterized by three distinct peaks in granitoid emplacement at 130-126 Ma, 118-113 Ma, and 108-102 Ma, with clear lulls in between. Mid-Cretaceous magmatism from elsewhere in West Antarctica, Patagonia, and New Zealand also featured marked episodicity during the mid- Cretaceous and recorded remarkable continuity along the West Gondwana margin. The three distinct magmatic events represent second-order episodicity relative to the primary episodicity that occurred on a cordillera scale and is a feature of the North and South American Pacific margin. Flare-up events require the development of a highly fusible, lower-crustal layer resulting from the continued underplating of hydrous mineralogies in the melt-fertile lower crust as a result of long-lived subduction. However, the actual trigger for melting is likely to result from external, potentially tectonic factors, e.g., rifting, plate reorganization, continental breakup, or mantle plumes. © 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/185020
作者单位	British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; CASP (formerly known as Cambridge Arctic Shelf Programme), 181A Huntingdon Road, Cambridge, CB3 0DH, United Kingdom; Swedish Museum of Natural History, Box 50007, Stockholm, SE-104 05, Sweden
推荐引用方式 GB/T 7714	Riley T.R.,Burton-Johnson A.,Flowerdew M.J.,et al. Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula, and correlations along the Gondwana margin[J],2018,130(2021-07-08).
APA	Riley T.R.,Burton-Johnson A.,Flowerdew M.J.,&Whitehouse M.J..(2018).Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula, and correlations along the Gondwana margin.Bulletin of the Geological Society of America,130(2021-07-08).
MLA	Riley T.R.,et al."Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula, and correlations along the Gondwana margin".Bulletin of the Geological Society of America 130.2021-07-08(2018).