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首页> 外文期刊>Journal of geodynamics >Tectonics and metallogenesis of Proterozoic rocks of the Reading Prong
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Tectonics and metallogenesis of Proterozoic rocks of the Reading Prong

机译：雷丁元古生代岩石的构造与成矿作用

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摘要

Detailed geologic mapping, petrography, and major and trace-element analyses of Proterozoic rocks from the Greenwood Lake Quadrangle, New York are compared with chemical analyses and stratigraphic information compiled for the entire Reading Prong. A persistent regional stratigraphy is evident in the mapped area whose geochemistry indicates protoliths consistent with a back-arc marginal basin sequence. The proposed marginal basin may have been floored by an older sialic basement and overlain by a basin-fill sequence consisting of a basal tholeiitic basalt, basic to intermediate volcanic or volcaniclastic rocks and carbonate sediments, a bimodal calc-alkaline volcanic sequence, and finally volcaniclastic, marine, and continental sediments. The presence of high-chlorine biotite and scapolite may indicate circulation of brine fluids or the presence of evaporite layers in the sequence. Abundant, stratabound magnetite deposits with a geologic setting very unlike that of cratonic, Proterozoic banded-iron formations are found throughout the proposed basin sequence. Associated with many of the magnetite deposits is unusual uranium and rare-earth element mineralization. It is proposed here that these deposits formed in an exhalative, volcano-genie, depositional environment within an extensional back-arc marginal basin. Such a tectonic setting is consistent with interpretations of protoliths in other portions of the Reading Prong, the Central Metasedimentary Belt of the Canadian Grenville Province, and recent interpretation of the origin of the Franklin lead-zinc deposits, suggesting a more cohesive evolving arc/back-arc tectonic model for the entire Proterozoic margin of the north-eastern portion of the North American craton.
机译：将纽约格林伍德湖四边形的元古代岩石的详细地质制图，岩石学以及主要和微量元素分析与整个Reading Prong汇编的化学分析和地层信息进行了比较。在测绘地区明显存在持续的区域地层，其地球化学表明原生岩与弧后边缘盆地层序一致。拟建的边缘盆地可能已被一个较早的唾液基底所覆盖，并被盆地填充序列所覆盖，该序列由基底的玄武质玄武岩，基本到中火山岩或火山碎屑岩和碳酸盐沉积物，双峰钙碱性火山岩序列，最后是火山碎屑岩组成。 ，海洋和大陆沉积物。高氯黑云母和方沸石的存在可能表明该序列中盐水的循环或蒸发层的存在。在整个拟建的盆地层序中都发现了具有地质背景的大量分层约束磁铁矿床，与克拉通，元古代带状铁地层非常不同。与许多磁铁矿有关的是异常的铀和稀土元素矿化。在此提出，这些沉积物是在延伸的弧后边缘盆地内的呼气性火山岩沉积环境中形成的。这样的构造背景与雷丁五爪，加拿大格林维尔省中央准沉积带的其他部分的原生石解释以及对富兰克林铅锌矿床成因的最新解释相一致，这表明弧线/背线的演化更具凝聚力。北美克拉通东北部整个元古代边缘的弧构造模型。

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