Crustal structure of the Cascadia subduction zone, southwestern British Columbia, from potential field and seismic studies
Crustal structure of the Cascadia subduction zone, southwestern British Columbia, from potential field and seismic studies
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来自位场和地震研究的不列颠哥伦比亚省西南部卡斯卡迪亚俯冲带的地壳结构
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
S. Dehler
中科院分区：
文献类型：
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作者：
R. Clowes;D. J. Baird;S. Dehler
卡斯卡迪亚北部俯冲带是大洋探险者、胡安德富卡北部板块和北美大陆板块之间的交汇区。位场和新的地震反射数据与以前的地震结果和地质相结合，可以从2.5维和3维解释中推导出一系列密度-磁化率剖面和从洋盆到火山弧的块体密度模型。沉积楔体的横向范围和厚度沿该带变化很大。狭窄的环太平洋变质沉积地体位于Wrangellia的西面，延伸了温哥华岛的长度，与Wrangellia吸积后的走滑断层侵位一致。蛇绿岩地体位于环太平洋地体的海上，但并不向北延伸到胡安德·富卡板块之外。在这一地区，新月地体呈走滑或斜向会聚的形式侵位。
The northern Cascadia subduction zone is a region of convergence between the oceanic Explorer and northern Juan de Fuca plates and the continental North American plate. Potential field and new seismic reflection data coupled with previous seismic results and geology enable derivation of a series of density – magnetic susceptibility cross sections and a block density model from the ocean basin to the volcanic arc from 2.5- and 3-dimensional interpretations. The lateral extent and thickness of the accreted wedge vary significantly along the zone. The narrow, metasedimentary Pacific Rim terrane lies immediately west of Wrangellia and extends the length of Vancouver Island, consistent with its emplacement by strike-slip faulting following the accretion of Wrangellia. The ophiolitic Crescent terrane is a narrow slice lying seaward of the Pacific Rim terrane but not extending northward beyond the Juan de Fuca plate. In this region, the Crescent terrane was emplaced in a strike-slip or obliquely convergent style...