本文關鍵詞： 洋水背斜 構造解析 構造樣式 元素富集　出處：《中國地質大學(北京)》2017年碩士論文　論文類型：學位論文

【摘要】：為了探究黔中隆起洋水背斜的構造屬性與區(qū)域內大規(guī)模低溫成礦的物質基礎之間的聯(lián)系,本文通過詳細野外地質調查、文獻綜合整理、構造解析以及全巖地球化學微量分析和電子探針分析,確定了洋水背斜的構造樣式、變形序列、期次及成因,并在此基礎上,對洋水背斜與低溫成礦元素Sb、As、Ag、Au豐度異常關系進行了討論。本文主要取得以下主要成果:1)詳細解剖了洋水背斜構造特征及其形成過程。通過對切割洋水背斜的3條橫剖面和1條縱剖面的構造解析,厘定出了3期構造變形,即D1期E-W向縱彎褶皺、D2期N-S向縱彎褶皺以及D3期后期擠壓疊加改造。綜合構造解析結果表明,洋水背斜形成過程為印支期N-S向褶皺(D2期)橫跨疊加于加里東E-W向褶皺(D1期)之上,最后經過燕山期后期擠壓疊加改造(D3期)定型。2)厘定了低溫成礦元素異常層位,并初步確定其賦存狀態(tài)。地球化學分析表明,區(qū)內除新元古界板溪群Au的含量相對于揚子板塊上地殼平均豐度值表現(xiàn)為虧損,新元古界板溪群Sb、As、Ag平均含量和震旦系Sb、As、Ag、Au平均含量均高于揚子板塊上地殼平均豐度值,而高豐度值主要發(fā)育在新元古界板溪群的凝灰?guī)r以及震旦系洋水組的磷塊巖中。黃鐵礦電子探針的分析結果進一步說明,Sb、As和Au三種低溫成礦元素主要存在于原生黃鐵礦等礦物中。3)對低溫成礦元素富集、賦存及其可能的改造和活化途徑進行了綜合的構造-沉積探討。通過對洋水背斜的構造期次劃分、研究區(qū)低溫成礦元素背景特征以及區(qū)域地質演化史的梳理,可以認為洋水背斜的多期構造變形反映了華南地區(qū)在不同時期對Au、As以及Sb等低溫成礦元素的活化和富集提供了有利的環(huán)境。以上成果對于深入了解黔中隆起的形成、演化,及其對區(qū)域內廣泛發(fā)育的低溫成礦作用的貢獻,具有理論和實際意義。
[Abstract]:In order to explore the relationship between the tectonic attributes of the oceanic water anticline in the central Guizhou uplift and the material basis of large-scale low temperature metallogenesis in the region, this paper through the detailed field geological investigation, literature comprehensive arrangement. Tectonic analysis, geochemistry microanalysis and electron probe analysis have determined the structural style, deformation sequence, stage and origin of the oceanic water anticline. On this basis, the ore-forming elements SB of oceanic water anticline and low temperature have been determined. As,Ag. The anomalous relation of au abundance is discussed. In this paper, the main achievements are as follows: 1). The structural characteristics and formation process of the oceanic water anticline are dissected in detail. The structural analysis of 3 transverse sections and 1 longitudinal section of the ocean water anticline is carried out. Three tectonic deformations, namely D1 E-W longitudinal bend fold and D2 N-S longitudinal bend fold, as well as compression superposition reconstruction in the late D3 period are determined. The formation process of the oceanic anticline is from the Indosinian N-S fold D 2) to the Caledonian E-W fold D 1). Finally, the abnormal horizon of metallogenic elements at low temperature is determined and its occurrence state is preliminarily determined through the extrusion superposition reconstruction of D3 period in the late Yanshanian period. The geochemical analysis shows that the anomalous horizon of metallogenic elements at low temperature is determined. The contents of au in the Banxi Group except the Neoproterozoic are depleted in relation to the average crustal abundance of the upper Yangtze plate, the average content of SB _ (1) As-Ag in the Panxi Group of the Neoproterozoic and the Sinian system (Sinian). The average au content is higher than the average abundance value of the upper crust of Yangtze plate. The high abundance values are mainly developed in the tuff of the Panxi Group of the Neoproterozoic and the phosphorite of the Yangshui formation of the Sinian. Three low-temperature ore-forming elements, as and au, mainly exist in primary pyrite and other minerals. By dividing the tectonic stages of the oceanic water anticline, the background characteristics of low temperature metallogenic elements and the history of regional geological evolution in the study area are sorted out. It can be concluded that the multi-stage tectonic deformation of the oceanic anticline reflects the occurrence of au in different periods in South China. The activation and enrichment of low temperature metallogenic elements such as as and SB provide a favorable environment for further understanding the formation and evolution of the central Guizhou uplift and its contribution to the extensive low temperature mineralization in the region. It has theoretical and practical significance.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P612;P595

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