發(fā)布時(shí)間：2018-11-20 15:39

【摘要】：秦南礦區(qū)位于小秦嶺金礦田的北部。本文收集了前人的研究成果,在野外地質(zhì)調(diào)查及室內(nèi)資料綜合分析的基礎(chǔ)上,開展了成礦地質(zhì)特征、控礦因素及成礦規(guī)律的研究�；静槊髁饲啬系V區(qū)主要的構(gòu)造、地層、巖漿活動(dòng)及圍巖蝕變等地質(zhì)特征;查明了金礦的礦體特征、礦石特征及礦石類型等。確定了秦南金礦床形成于120Ma左右,即其形成時(shí)代為燕山晚期;確定了金、硫、鉛等成礦物質(zhì)均來源于地殼深部或上地幔,與太古代綠巖及燕山期構(gòu)造—花崗巖漿活動(dòng)有密切的聯(lián)系。大致確定出礦床的控礦因素及成礦機(jī)制:小秦嶺綠巖是金礦的重要礦源層;含礦構(gòu)造帶和石英脈內(nèi)不同階段構(gòu)造活動(dòng)所形成的裂隙系統(tǒng)控制了不同礦化階段的金礦化;燕山期花崗巖不僅為金的成礦作用提供了熱液—熱動(dòng)力條件,而且還提供了礦質(zhì)來源;秦南礦區(qū)金礦床主要成礦階段(Ⅱ、Ⅲ)溫度變化為283~153℃,表明礦床形成的溫度屬中、低溫,以中溫為主,秦南金礦床應(yīng)屬中—低溫巖漿期后熱液脈狀礦床成因類型。
[Abstract]:Qinnan mining area is located in the north of Xiaoqinling gold ore field. On the basis of field geological survey and comprehensive analysis of indoor data, this paper has studied the geological characteristics, ore-controlling factors and metallogenic regularity of ore deposits. The main geological features, such as structure, strata, magmatic activity and wall rock alteration, are basically found out, and the orebody characteristics, ore characteristics and ore types of gold deposits are also found out. It is determined that the gold deposit was formed in 120Ma, that is, the late Yanshanian gold deposit was formed in the late Yanshanian period. It is determined that gold, sulfur and lead are derived from the deep crust or upper mantle and are closely related to Archean greenstone and Yanshanian tectonic-granite magma. The ore-controlling factors and metallogenic mechanism of the deposit are roughly determined: the Xiaoqinling greenstone is an important source bed of gold deposits, and the fracture system formed by the tectonic activity in different stages of the ore-bearing structural belt and quartz vein controls the gold mineralization in different mineralization stages; Yanshanian granites not only provide hydrothermal and thermodynamic conditions for gold mineralization, but also provide the source of mineral material. The main metallogenic stages (鈪，

本文編號(hào)：2345296