气候变化领域集成服务门户(CCPortal): Oxygen isotopic investigation of silicic magmatism in the Stillwater caldera complex, Nevada: Generation of large-volume, low-δ18O rhyolitic tuffs and assessment of their regional context in the Great Basin of the western United States

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DOI	10.1130/B35021.1
	Oxygen isotopic investigation of silicic magmatism in the Stillwater caldera complex, Nevada: Generation of large-volume, low-δ18O rhyolitic tuffs and assessment of their regional context in the Great Basin of the western United States
	Watts K.E.; John D.A.; Colgan J.P.; Henry C.D.; Bindeman I.N.; Valley J.W.
发表日期	2019
ISSN	167606
起始页码	1133
结束页码	1156
卷号	131 期号:2021-07-08
英文摘要	Successive caldera-forming eruptions from ca. 30 to 25 Ma generated a large nested caldera complex in western Nevada that was subsequently dissected by Basin and Range extension, providing extraordinary cross-sectional views through diverse volcanic and plutonic rocks. A high-resolution oxygen isotopic study was conducted on units that represent all major parts of the Job Canyon, Louderback Mountains, Poco Canyon, and Elevenmile Canyon caldera cycles (29.2-25.1 Ma), and several Cretaceous plutons that flank the Stillwater caldera complex. We provide new oxygen and strontium isotope data for 12 additional caldera centers in the Great Basin, which are synthesized with > 150 published oxygen and strontium isotope analyses for regional Mesozoic basement rocks. Stillwater zircons span a large isotopic range (δ18Ozircon of 3.6‰-8.2‰), and all caldera cycles possess low-δ18O zircons. In some cases, they are a small proportion of the total populations, and in others, they dominate, such as in the low-δ18O rhyolitic tuffs of Job Canyon and Poco Canyon (δ18Ozircon = 4.0‰-4.3‰; δ18Omagma = 5.5‰-6‰). These are the first low-δ18O rhyolites documented in middle Cenozoic calderas of the Great Basin, adding to the global occurrence of these important magma types that fingerprint recycling of shallow crust altered by low-δ18O meteoric waters. The appearance of low-δ18O rhyolites in the Stillwater caldera complex is overprinted on a Great Basin-wide trend of miogeoclinal sediment contribution to silicic magmas that elevates δ18O compositions, making identification of 18O depletions difficult. Though not a nominally low-δ18O rhyolite, the tuff of Elevenmile Canyon possesses both low-δ18O and high-δ18O zircon cores that are overgrown by homogenized zircon rims that approximate the bulk zircon average, pointing to batch assembly of isotopically diverse upper crustal melts to generate one of the most voluminous (2500-5000 km3) tuff eruptions in the Great Basin. Despite overlapping in space and time, each caldera-forming cycle of the Stillwater complex has a unique oxygen isotope record as retained in single zircons. Most plutons that were spatially and temporally coincident with calderas have isotopic compositions that diverge from the caldera-forming tuffs and cannot be their cogenetic remnants. © 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/184959
作者单位	U.S. Geological Survey, Menlo Park, CA 94025, United States; U.S. Geological Survey, Denver, CO 80225, United States; Nevada Bureau of Mines and Geology, Reno, NV 89557, United States; Department of Earth Sciences, University of Oregon, Eugene, OR 97403, United States; Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States
推荐引用方式 GB/T 7714	Watts K.E.,John D.A.,Colgan J.P.,et al. Oxygen isotopic investigation of silicic magmatism in the Stillwater caldera complex, Nevada: Generation of large-volume, low-δ18O rhyolitic tuffs and assessment of their regional context in the Great Basin of the western United States[J],2019,131(2021-07-08).
APA	Watts K.E.,John D.A.,Colgan J.P.,Henry C.D.,Bindeman I.N.,&Valley J.W..(2019).Oxygen isotopic investigation of silicic magmatism in the Stillwater caldera complex, Nevada: Generation of large-volume, low-δ18O rhyolitic tuffs and assessment of their regional context in the Great Basin of the western United States.Bulletin of the Geological Society of America,131(2021-07-08).
MLA	Watts K.E.,et al."Oxygen isotopic investigation of silicic magmatism in the Stillwater caldera complex, Nevada: Generation of large-volume, low-δ18O rhyolitic tuffs and assessment of their regional context in the Great Basin of the western United States".Bulletin of the Geological Society of America 131.2021-07-08(2019).