干旱区生态环境知识资源中心(Arid): The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? I: Mexico to Nevada(1)

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DOI	10.1139/cjes-2020-0154
	The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? I: Mexico to Nevada(1)
	Hildebrand, Robert S.; Whalen, Joseph B.
来源期刊	CANADIAN JOURNAL OF EARTH SCIENCES
ISSN	0008-4077
EISSN	1480-3313
出版年	2021
卷号	58 期号:8 页码:670-696
英文摘要	The Peninsular Ranges orogeny occurred during the mid-Cretaceous at similar to 100 Ma and affected rocks from southern Mexico to Alaska. The event resulted from the closing of an Early Cretaceous marine arc trough, named the Bisbee-Arperos seaway in Mexico and Arizona, and the Cinko Lake arc trough in the Sierra Nevada. The trough was an ocean that formed after the Late Jurassic - Early Cretaceous Nevadan orogeny and associated post-collisional magmatism. It was open for similar to 40 million years and closed by westward subduction. Here, we focus initially on the most complete cross section, located in southwestern Mexico, where a west-facing Albian carbonate platform, with subjacent siliciclastic rocks built on the western margin of North America, was pulled down into a trench at 100 Ma, buried in hemipelagic mud and Cenomanian flysch, then overthrust from the west by rocks of the 140-100 Ma Santiago Peak - Alisitos arc and its substrate, the Guerrero Superterrane, which collectively document westerly subduction. This tectonically thickened collision zone was exhumed and intruded by 99-84 Ma distinctive postcollisional tonalite-granodiorite plutonic complexes, all with Sr/Y > 20, Sm/Yb > 2.5, Nb/Y > 0.4, and La/Yb > 10. These geochemical features are typical of slab failure, not arc magmas. The post-collisional plutons, previously considered to represent arc flare-ups, were derived from melting of the descending slab following arc-continent collision. Remnants of the arc, basin, related eastvergent 100 Ma thrusts, flexural foredeep, and 99-84 Ma slab failure plutons are traced from the Peninsular Ranges, through the Mojave Desert to the Sierra Nevada where similar rocks, relations, and ages occur. Along the western, back-arc, side of the orogen after collision and slab break-off, but during exhumation, east-dipping reverse faults with >10 km of east-side up movement shed 100-85 Ma plutonic and other debris westward from the hinterland into troughs such as the Valle and Great Valley. We extend our synthesis northward, from west-central Nevada to Alaska, in Part II.
英文关键词	orogeny North American Cordillera arc magmatism arc-continent collision slab failure magmatism Peninsular Ranges orogeny
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000683738600002
WOS关键词	CENTRAL SIERRA-NEVADA ; ARC-CONTINENT COLLISION ; CAMBRIAN MIOGEOCLINAL ROCKS ; GUERRERO COMPOSITE TERRANE ; SOUTHWESTERN NORTH-AMERICA ; SOUTHERN SPRING MOUNTAINS ; TUOLUMNE INTRUSIVE SUITE ; MOJAVE-SONORA MEGASHEAR ; PINE VOLCANIC FIELD ; GREAT VALLEY GROUP
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362768
作者单位	[Whalen, Joseph B.] Geol Survey Canada, 601 Booth St, Ottawa, ON K1A 0E8, Canada
推荐引用方式 GB/T 7714	Hildebrand, Robert S.,Whalen, Joseph B.. The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? I: Mexico to Nevada(1)[J],2021,58(8):670-696.
APA	Hildebrand, Robert S.,&Whalen, Joseph B..(2021).The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? I: Mexico to Nevada(1).CANADIAN JOURNAL OF EARTH SCIENCES,58(8),670-696.
MLA	Hildebrand, Robert S.,et al."The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? I: Mexico to Nevada(1)".CANADIAN JOURNAL OF EARTH SCIENCES 58.8(2021):670-696.