摘要
柴家庄和酒刺梁花岗岩是西秦岭地区两个典型的岩体。岩石均为二长花岗岩,岩石化学表现为富硅、偏碱和铝过饱和的特征,均属钙碱性系列花岗岩;斜长石矿物电子探针分析显示斜长石An为6.68～12,主要为钠长石和更长石,岩浆演化不明显。稀土元素配分型式均为几乎不具负铕异常的轻稀土富集型。两个岩体岩石地球化学特征相近,但由于其时代相差很远,并非同源岩浆结晶演化的产物。柴家庄岩体虽然可为柴家庄金矿提供部分成矿物源,但不可能提供热能;酒刺梁岩体既不能为柴家庄金矿提供热能,也不可能提供物源。
The Chaijiazhuang and Jiuciliang adamelite granites are two typical granites in western part of Qinling Mts. The lithogeochemical characteristics indicate that the two granites are Si-rich, alkali-slight-rich and Al-over-saturation, belonging to the alkali-series granite. The electron microprobe analysis of plagioclase shows that their Ans are from 6.68 ～ 12,and belong to albite and oligocase. Magmatic evolution of the intrusion is not clear. The REE spider diagram patterns are LREE-rich patterns without Eu depletion. In a word, both granites have similar lithogeochemical characteristics. But they aren't from the same parent magma because there is a long time between their formations. Chaijiazhuang granite might provide partial ore-forming mineral for the Chaijiazhuang Au-deposite but not the heat energy source. The Jiuciliang granite might not provide the ore-forming material or the heat source.
出处
《地质调查与研究》
2004年第2期86-91,共6页
Geological Survey and Research
基金
地质找矿科技攻关项目"北秦岭西段宕昌-教场坝地区中生代构造岩浆岩与金铀多金属矿产的控矿因素成矿规律及找矿方向研究(85-01-018-06)
关键词
柴家庄花岗岩
酒刺梁花岗岩
地球化学
金矿
西秦岭
Chaijiazhuang granite
Jiuciliang granite
geochemistry
gold ore
west Qiling Mts.
