安徽张八岭地区管店岩体成因及其与上成金矿床的关系  

Genesis of Guandian Pluton and Its Relationship with Shangcheng Gold Deposit from Zhangbaling Area,Anhui Province

作　　者：周力[1] 张均[1] 王健[1] 孙腾[1] 

机构地区：[1]中国地质大学资源学院,武汉430074

出　　处：《地质科技情报》2014年第1期32-40,共9页Geological Science and Technology Information

摘　　要：管店岩体位于安徽东部张八岭隆起北段,主要由二长岩和石英二长岩组成。该岩体为一中酸性侵入岩体,富钾、准铝质,属于高钾钙碱性I型花岗岩类,同时显示出与中国东部众多中生代高Ba-Sr花岗岩相类似的地球化学特征:具有高Ba、Sr和LREE含量,高Sr/Y比值、La N/Yb N比值,低Y和HREE含量,低Rb/Sr比值。结合岩体的岩石学、岩石地球化学及区域构造演化,推测管店岩体的形成与下地壳基性岩石的部分熔融有关。此外,管店岩体与张八岭地区的脉状金矿床有着密切的时空联系。对上成金矿床的同位素研究显示:矿床早阶段成矿流体为岩浆水,成矿物质中硫的来源可能与管店侵入岩体有关。该矿床属于典型的岩浆期后热液型脉状金矿床。Guandian pluton is located in the northern section of Zhangbaling uplift, eastern part of Anhui Province, which consists of quartz diorite, granodiorite and monzonite granite. It is an intermediate acid intrusive body, potassium rich, quasi-aluminous, belongs to high K calc-alkaline I type granite, and shows similar geochemical characteristics with many Mesozoic high Ba-Sr granites in eastern China： with a high Ba, Sr and LREE content, high ratio of Sr/Y and LaN/YbN, and low Y, HREE content, low ratio of Rb/ Sr. The petrological, geochemical and regional tectonic evolution, indicate that the formation of Guandian pluton is related to the partial melting of lower crustal basic rocks. In addition, Guandian pluton has a close temporal and spatial contact with lode gold deposits in Zhangbaling area. The isotope study on the Shangcheng gold deposit shows that early stage metallogenic fluid of the deposit is magmatic water, and sulfur source of the ore forming material may be related to the Guandian pluton. This deposit belongs to a typical magmatic hydrothermal type lode gold deposit.

关 键 词：管店岩体 岩石成因 上成金矿床 张八岭隆起 

分 类 号：P588.12[天文地球—岩石学]