Structure, petrology, and tectonic history of the Leech River complex northwest of Victoria, Vancouver Island
Structure, petrology, and tectonic history of the Leech River complex northwest of Victoria, Vancouver Island
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温哥华岛维多利亚西北部利奇河杂岩体的结构、岩石学和构造历史
DOI：
10.1139/e82-161
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发表时间：
1982
影响因子：
1.4
通讯作者：
D. Cowan
中科院分区：
文献类型：
--
作者：
L. Fairchild;D. Cowan
维多利亚州西北45 公里处的Leech River复合体由变质的泥质岩、砂岩和可能晚侏罗世至白垩纪的次要火山岩、硅质岩和砾岩组成。该组合经历了两次相似的变形事件，其间区域缩短导致宏观东倾褶皱和相关的同轴、中观线性构造、寄生褶皱和轴面解理。沿着发育中的卵裂的碎裂扰乱了分层，并最终导致了这两个事件中的换位。区域低压绿片岩-角闪岩相(红柱石-十字石-黑云母)变质作用始于第一次变形，并延续到第二次变形的衰退期。复合长英质岩床的侵入作用与变形变质作用同步，K-Ar年龄约为39-41 Ma。形成该综合体南部边界的利奇河断层是一个由两到四条次平行断层组成的地带。都是..。
The Leech River complex 45 km northwest of Victoria consists of metamorphosed pelitic rocks, sandstone, and minor volcanic rocks, chert, and conglomerate of probable Late Jurassic to Cretaceous age. The assemblage experienced two similar deformational events during which regional shortening induced macroscopic east-plunging folds and related coaxial, mesoscopic linear structures, parasitic folds, and axial-plane cleavages. Fragmentation along the developing cleavages disrupted layering and eventually led to transposition during both events. Regional, progressive, low-pressure greenschist- to amphibolite-facies (andalusite–staurolite–biotite) metamorphism began during the first deformation and extended into the waning stages of the second. Intrusion of composite felsic sills was synchronous with deformation and metamorphism, which concluded about 39–41 Ma, according to K–Ar data. The Leech River fault, which forms the southern boundary of the complex, is a zone of two to four subparallel faults. All are re...