| Stephen G. Peters,李永明,黄佳展.内华达北中部新月谷—独立金矿区线性构造带的证据[J].地质找矿论丛,2000,(3):204-215 |
| 内华达北中部新月谷—独立金矿区线性构造带的证据 |
| EVIDENCE FOR THE CRESCENT VALLEY-INDEPENDENCE LINEAMENT, NORTH-CENTRAL NAVADA U. S. |
| 投稿时间：2000-03-07 |
| DOI：10.6053/j.issn.1001-1412.2000.3. 002 |
| 中文关键词: CVIL线性体 变形 构造岩 热液活动 热液通道 内华达 美国 |
| 英文关键词:CVIL lineament deformation intensely tectonized rock hydrothermal activity fluid conduit Navada US |
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| 中文摘要: |
| 内华达北中部的新月谷—独立金矿区线性构造(CVIL)是一个呈20°～30°走向、具多期变形、侵入及热液活动的构造带,该带从独立金矿区向南至科特兹矿山附近延伸达90km,经过科特兹—派普来恩、卡林及独立三个主要的沉积岩型金矿区,含有罗伯茨山异地岩(可能是奥陶系Vinini组)的强烈构造岩,NE向的断层,白垩或第三纪的NE向的岩墙。变形带的组构具混杂岩的特点,但混杂岩中也显示有与晚三叠世和晚侏罗世之间形成的褶皱展布方向一致的定向组构。此外,沿CVIL带局部出现有第三纪的碧玉状岩石、角砾岩、方解石脉及脱钙蚀变作用。CVIL构造带南北两端成群出现的沉积岩型金矿床具有与卡林矿带金矿床相同的矿物特征。上述二个矿区都有NE向的断层,穿越罗伯茨山异地岩上盘中的构造窗和构造高地。CVIL可能是形成某些金矿床的主要热液通道。 |
| 英文摘要: |
| The Crescent Valley-Independence lineament (CVIL) in north central Navada is defined by deformation, igneous intrusions, and hydrothrmal activity of several ages along N 20E-to N 30E-striking zone. This zone extends for about 90 km from near the Independence Mining District in the north to near the Cortez Mine in the south. In the center of CVIL are exposed intensely tectonized rock of the upper plate of the Roberts Mountains allochthon, probably Ordovician Vinini Formation, northeast-striking faults, or Cretaceous or Tertiary northeast-striking dykes are exposed. Fabrics in deformed zones have characteristics of melange that also exhibit fabric orientation parallel to fold orientations that result form deformation between the Late Permian and Late Jurassic. In addition, Tertiary-age jasperoid, breccia, calcite veins, and decalcification locally are present along the CVIL. Clusters of sedimentary rock hosted gold deposits in the north and south ends of CVIL contain several mineralogical features common to depopsits in the carlin trend area. All the district contain northeast-striking faults that corss cut tectonic windows and structural highs through the upper plate of the Roberts Mountains allochthon. The CVIL may be a major fluid conduit that was instrumental in formation of some of the gold deposits. |
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