湘西花垣李梅矿田含矿层清虚洞期岩相古地理分析及成矿预测

发布时间：2018-06-17 19:17

本文选题：湘西李梅 + 沉积、构造岩相　；参考：《地学前缘》2017年02期

【摘要】：通过对李梅矿田剖面序列、含矿岩系、岩石组分、沉积构造特征分析研究,结合研究区区域地层特征及工程资料,将研究区寒武系清虚洞组含矿岩系由北西至南东依次划分为局限台地相、藻礁灰岩相、浅水陆棚相。采用单因素分析多因素综合作图法这一定量的岩相古地理学方法论为指导,以钻孔厚度这一单因素及不同时段地层叠加的多因素编制了湘西李梅矿田清虚洞期岩相古地理图。确定了主要含矿岩系为清虚洞组藻礁灰岩,铅锌矿床均分布于藻礁灰岩相中。在富矿体集中地段,藻灰岩的厚度一般都大于100m,清虚洞期沉积盆地分布受NE—NNE方向构造控制。最后结合研究区沉积特征和主要断裂(花垣—茶洞大断裂)活动特征,进而进行构造沉积岩相成矿规律研究。指出下一步找矿勘探靶区,为下一步找矿工作提供借鉴。
[Abstract]:Based on the analysis of the Li Mei ore field profile sequence, ore-bearing rock series, rock composition and sedimentary structural characteristics, combined with the regional stratigraphic characteristics and engineering data of the study area, The ore-bearing rocks of the Cambrian Qingxuodong formation in the study area are divided into restricted platform facies, algal reef limestone facies and shallow water shelf facies from the north west to the south east. The lithofacies paleogeography of Li Mei Orefield in Xiangxi is compiled under the guidance of a certain amount of lithofacies paleogeography methodology by means of single factor analysis and multifactor comprehensive mapping method, which is based on the single factor of borehole thickness and the stratigraphic superposition of different periods. The main ore-bearing rocks are the algal reef limestone of Qingxuodong formation, and the lead-zinc deposits are all distributed in the algal reef limestone facies. In the concentrated area of ore-rich bodies, the thickness of algal limestone is generally greater than 100 m, and the distribution of sedimentary basins in Qingxuxudong period is controlled by NE-NNE direction. Finally, combined with the sedimentary characteristics of the study area and the active characteristics of the main faults (Huaguan-Chadong fault), the metallogenic regularity of tectonic sedimentary lithofacies was studied. The paper points out the target area of prospecting and exploration in the next step, and provides reference for the next prospecting work.
【作者单位】：青海省有色地质矿产勘查局七队;长安大学地球科学与资源学院;中国地质科学院地质力学研究所;中国地质大学(北京)地球科学与资源学院;
【基金】：中国地质科学院矿产资源研究所基金项目(12120113091400) 科学技术部国家科技支撑计划项目(2011BAB04B07-03) 山东省国土资源厅基金项目(鲁地调合【2012】33号)
【分类号】：P612

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