西秦岭礼岷金矿田构造压影域控矿模式

来源期刊：中南大学学报(自然科学版)2002年第3期

论文作者：奚小双 张曾荣

文章页码：221 - 224

关键词：花岗岩体;共轭断裂;构造压影域;西秦岭礼岷矿田

Key words：granite mass; conjugate fault; press shadow domain; Limin gold deposit; western Qinling

摘    要：西秦岭礼岷金矿田分布五大花岗岩体.经研究发现,该五大岩体沿“X”型共轭断裂侵位于泥质地层中,金矿床产于岩体外接触带的特定位置,形成于造山期后的伸展构造环境.在共轭断裂剪切作用下,在岩体外接触带中形成挤压域和压影域非均匀应力场,金矿床仅限于压影域内,这是岩浆期后成矿热液向低压构造区迁移的结果.据此,在矿田预测中发现了新的金矿床.

Abstract: Five granite masses are distributed at Limin gold ore area in western Qinling, intruding along “X” type conjugate faults in argillite. The gold mineral deposits are located at special domains outside the contact aureole of intrusive masses. Both of the intrusive masses and mineral deposits were formed under the condition of stretch tectonics at late orogenesis. By the process of conjugate shear faults, the inhomogeneous stress fields of compression domain and press shadow domain formed at the outer contact aureole of intrusive masses and gold mineral deposits formed in the domains of press shadow. These are the results of magmatic hydrothermal immigrated into the lower stress area. Under the guard of this mechanism, some more gold mineral deposits are discovered.