气候变化领域集成服务门户(CCPortal): Butcher ridge igneous complex: A glassy layered silicic magma distribution center in the ferrar large igneous province, antarctica

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DOI	10.1130/B35340.1
	Butcher ridge igneous complex: A glassy layered silicic magma distribution center in the ferrar large igneous province, antarctica
	Nelson D.A.; Cottle J.M.; Schoene B.
发表日期	2020
ISSN	167606
起始页码	1201
结束页码	1216
卷号	132 期号:2021-05-06
英文摘要	The Butcher Ridge igneous complex, Antarctica, is an-6000 km3 hypabyssal silicic intrusion containing rhythmically layered glassy rocks. Baddeleyite U-Pb geochronologic analysis on a sample of the Butcher Ridge igneous complex yielded an age of ca. 182.4 Ma, which confirms that it was emplaced synchronously with the Ferrar large igneous province. Rocks of the Butcher Ridge igneous complex vary from basaltic andesite to rhyolite, and so the inferred volume of the Butcher Ridge igneous complex makes it the most voluminous silicic component of the Ferrar large igneous province. Major-element, trace-element, and isotopic data combined with binary mixing, assimilation-fractional crystallization (AFC), and energy-constrained AFC models are consistent with formation of Butcher Ridge igneous complex silicic rocks by contamination of mafic Ferrar parental magma(s) with local Paleozoic plutonic basement rocks. Field and petrographic observations and evidence for alkali ion exchange suggest that the kilometer-long, meter-thick enigmatic rhythmic layering formed as a result of secondary hydration and devitrification of volcanic glass along parallel fracture networks. The regularity and scale of fracturing/layering imply a thermally driven process that occurred during shallow emplacement and supercooling of the intrusion in the upper crust. We suggest that layering observed in the Butcher Ridge igneous complex is analogous to that reported from terrestrial and Martian cryptodomes, and therefore it is an ideal locality at which to study layering processes in igneous bodies. © 2019 Geological Society of America.
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/184785
作者单位	Department of Earth Science, University of California, Santa Barbara, CA 93106-9630, United States; Department of Geosciences, Princeton University, Princeton, NJ 08544, United States
推荐引用方式 GB/T 7714	Nelson D.A.,Cottle J.M.,Schoene B.. Butcher ridge igneous complex: A glassy layered silicic magma distribution center in the ferrar large igneous province, antarctica[J],2020,132(2021-05-06).
APA	Nelson D.A.,Cottle J.M.,&Schoene B..(2020).Butcher ridge igneous complex: A glassy layered silicic magma distribution center in the ferrar large igneous province, antarctica.Bulletin of the Geological Society of America,132(2021-05-06).
MLA	Nelson D.A.,et al."Butcher ridge igneous complex: A glassy layered silicic magma distribution center in the ferrar large igneous province, antarctica".Bulletin of the Geological Society of America 132.2021-05-06(2020).