钦州湾-杭州湾构造结合带（南段）地质演化和找矿方向

钦州湾-杭州湾结合带是位于扬子与华夏两大古陆块中间的巨型构造结合带。根据内部结构不均一性和演化历史的差异，钦-杭结合带可划分为3段：北（东）段、中段和南（西）段，分界线大致为北纬24°和北纬27°。中段与南岭带大体一致；北段指南岭以北地区，即绍兴-江山-萍乡一带；南段位于南岭以南区域，大致与云开-十万大山带相当。钦-杭结合带南段是华南大陆壳再造和矿产资源寻找的重要研究课题。它的地质演化与钦-杭结合带具有整体一致性，特别是具有一致的开-合历史。震旦系底部的粤西云浮大降坪块状硫化物矿床是海底喷流沉积的产物，它与信宜和陆川新元古代蛇绿岩等是南段洋壳存在的重要证据。在进一步的矿床勘查中，要重视斑岩型铜（钼）矿床的寻找。中酸性斑岩体来自于元古宙岛弧底部玄武质岩石（下地壳）在中生代时期的部分熔融，本质上该类矿床带有岛弧俯冲环境的基因。

Geological evolution and ore-prospecting targets in southern segment of Qinzhou Bay-Hangzhou Bay juncture orogenic belt, southern China

The Qinzhou Bay (Q)-Hangzhou Bay (H) juncture orogenic belt is a giant suture separating Yangzi block from Cathaysian block in South China. It can be divided into three segments, i.e., the northern, the middle and the southern on the basis of the geological variation, separated roughly by the 24° and 27° north latitude. The middle segment is in accordance with the traditional Nanling belt, the northern segment is roughly coincident with the Shaoxing - Jiangshan - Pingxiang zone, and the southern segment is consistent with Yunkai - Shiwandashan Mountainous zone. The southern segment of the Q - H joint orogenic belt is one of the most important topics in studying reworking of the continental crust and mineral prospecting in South China. It is coincident with the whole juncture orogenic belt in geological evolution. The Neoproterozoic massive sulfide deposits occurring at Dajiangping and ophiolite at Xinyi and Luchuan of Yunkai area are direct evidence for existence of an old ocean. More attention should be paid to porphyry copper deposits in future mineral resource prospecting in the study area. These ore deposits are hosted in granitic porphyry which originated from partial melting of the island-arc basaltic rocks associated with subduction of the Proterozoic oceanic plate.