Extension of the Cordilleran Miogeosynclinal Belt to the San Andreas Fault, Southern California
Extension of the Cordilleran Miogeosynclinal Belt to the San Andreas Fault, Southern California
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科迪勒拉山地槽带延伸至南加州圣安德烈亚斯断层
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
F. G. Poole
中科院分区：
文献类型：
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作者：
J. H. Stewart;F. G. Poole
圣贝纳迪诺山脉和西部莫哈韦沙漠地区的海相沉积岩与大盆地南部已知的最上层前寒武纪和一些古生代岩石的相关性表明，一个几乎完整的科迪勒拉山脉微地槽岩系列延伸到加州南部。圣贝纳迪诺山脉的前中生代岩石包括：（1）前寒武纪时代的片麻岩和片岩（部分年龄大于17.5亿年）; (2)Saragossa石英岩，在这里被认为是最晚的前寒武纪和早寒武纪的时代;和（3）熔炉石灰岩，其上部被当地的巨化石确定为密西西比纪，可能是宾夕法尼亚纪或二叠纪，但在这里被认为包含早寒武纪至二叠纪（？）的地层。萨拉戈萨石英岩包含不同的单元，这些单元在岩性上可与最上部的前寒武纪和下寒武纪层序（包含东部莫哈韦沙漠和南部大盆地的约翰尼组、斯特林组、伍德峡谷组和扎布里斯基组）的部分地层相关联。莫哈韦沙漠西部石英岩山上的一些岩石单元与莫哈韦沙漠东部和大盆地南部的前寒武纪和寒武纪最上部的伍德峡谷组、扎布里斯基组、卡拉拉组和博南扎国王组具有岩性相关性。在加州南部，科迪勒拉山脉的微地槽带被圣安德烈亚斯断层斜截;在西北450 km处的Salinian地块可能出现一个位移段。在墨西哥西北部圣安德烈亚斯断层以东也发现了科迪勒拉山脉的微地槽岩石，这表明大盆地和墨西哥之间的地槽趋势发生了重大变化。
Correlations of marine sedimentary rocks in the San Bernardino Mountains and western Mojave Desert area with known uppermost Precambrian and some Paleozoic rocks of the southern Great Basin suggest that a nearly complete succession of Cordilleran miogeosynclinal rocks extends into southern California. Pre-Mesozoic rocks in the San Bernardino Mountains consist of (1) gneiss and schist of Precambrian age (in part older than 1,750 m.y.); (2) the Saragossa Quartzite, here considered to be latest Precambrian and Early Cambrian in age; and (3) the Furnace Limestone, the upper part of which is locally dated by megafossils as Mississippian and possibly Pennsylvanian or Permian but considered here to contain strata ranging in age from Early Cambrian to Permian(?). The Saragossa Quartzite contains distinct units that can be lithologically correlated confidently with parts of the uppermost Precambrian and Lower Cambrian sequence containing the Johnnie, Stirling, Wood Canyon, and Zabriskie Formations of the eastern Mojave Desert and the southern Great Basin. Some rock units on Quartzite Mountain in the western Mojave Desert are lithologically correlated with the uppermost Precambrian and Cambrian Wood Canyon, Zabriskie, Carrara, and Bonanza King Formations of the eastern Mojave Desert and southern Great Basin. The Cordilleran miogeosynclinal belt is obliquely truncated by the San Andreas fault in southern California; a displaced segment may occur in the Salinian block 450 km to the northwest. Cordilleran miogeosynclinal rocks also occur in northwestern Mexico east of the San Andreas fault, indicating a major change in trend of the geosyncline between the Great Basin and Mexico.