江西灵山杂岩体地质特征及成因探讨

江西灵山花岗岩体位于钦杭结合带南带之怀玉拗陷，呈环形岩基状产出；SiO2含量69.16%~76.45%， K2O+Na2O为6.41%~9.44%，属酸性-超酸性、高钾钙碱性-钾玄岩系岩石，里特曼指数平均为2.42；富集Rb、Th、U、Nd、Hf、Zr、Y 、Nb、Ta等元素，亏损Ba、Sr、P、Ti等元素；稀土元素总量为79.08×10-6~629.88×10-6，La/Yb比值为4.66~20.86，δEu=0.11~0.45，显示出强烈的Eu负异常。作者在《江西省灵山地区矿产地质调查》工作中收集到杂岩体各侵入体之间的侵入接触构造，研究发现岩体受北东和北西向断裂交汇点控制，认为属陆内局部伸展环境下具有两次以上由南西向北东上侵呈非对称的气球膨胀式定位的“A”型、混熔型花岗岩，成岩成矿时代均为早白垩世；葛源至樟村是寻找与灵山岩体相类似的矿床有利地段。

Geological Characteristics and Genesis of the Lingshan Complex in Jiangxi Province

The Lingshan granitic pluton is located at Huaiyu depression in the southern belt of Qinhang junction, Jiangxi Province. Itoccurs as a multistage batholith in a circle shape. The whole-rock SiO2 contents of the Linshan granite range from 69.16 wt.% to 76.45wt.%, and the contents of K2O+Na2O range from 6.41 wt.% to 9.44 wt.%. They are acid to ultra-acid, and belong to the high Kcalc-alkaline to shoshonite series. The Rittmann Index is in an average of 2.42. They are enriched in Rb, Th, U, Nd, Hf, Zr, Y, Nb andTa, but depleted in Ba, Sr, P and Ti. The total REE contents are in the range of 79.08×10-6～629.88×10-6. The ratios of La/Yb are inthe range of 4.66~20.86, while the δEu values range from 0.11 to 0.45, with strong negative Eu anomalies. The authors analyzed theintrusive contact relationship between the different units of the complex after“Mineral resources geological survey for Lingshan area inJiangxi province”. The data show that the complex pluton was controlled by the northeast to northwest fracture intersection. The locallyintracontinental extension environment induced the A-type granitic melts ascending and emplacement from southwest to northeast asasymmetric inflatable balloons. Their rock- and ore-forming ages are around early Cretaceous. Geyuan-Zhangcun is a potential area tofind ore deposits similar to those associated with the Lingshan granitic pluton.