宁镇地区内生矿产找矿标志及找矿方向

Prospecting Criteria for Endogenetic Deposit in Ning-Zhen Area. Jiangsu

宁镇地区位于扬子准地台下扬子台褶带东段,系长江中下游铁铜多金属成矿带的一部分,已知矿床(点)54个,其矿床在一定的时空内,受控于岩浆岩、地层、构造、及在成矿过程中和成矿后的地质、地球物理化学等因素,显示出一系列指示找矿的各种现象和线索,提供进一步找矿标志,从而根据本区地质特征,指出进一步找矿方向。

Nanjing-Zhenjiang area, part of the Yangtze metallogenic belt of Fe-Cu-polymetallic deposits, has as many as 54 metallic deposits which in a certain space-time domain are controlled by tectonic feature as well as geological, geophysical and geochemical activities during or after mineralization. Each course of mineralization has left some clues which can be the prospecting criteria. The space-time distribution of different series magmatic rock and corresponded geochemical characteristics is the important prospecting criteria of different ore type, in which the syntectic meddle acid magma of second stage of Late Yanshanian intrusion is the very important base for Cu-S-polymetallic deposits. Anticline.combined with longitudinal fault,other fault,magmatic thermal liquid and corresponded geophysical and geochemical halos are the important clues indicating the position of deposit. The Si/Ca interface associtated with interlayer gliding fault, intrusive contact fault is the favorite place for ore deposit. Potash feldspathization, silication are the important alteration criteria for porphyry Cu-Mo-W deposits. Albitization is the criteria for Fe remobilization.