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对秦祁结合部位宝鸡地区香泉正长花岗岩进行了LA-ICP-MS锆石U-Pb年龄和岩石地球化学研究。结果显示,锆石~(206)Pb/~(238)Pb年龄加权平均值为410±5Ma(MSWD=0.20,n=18),限定该岩体的形成时代为早泥盆世。香泉正长花岗岩具有高硅(SiO_2=69.63%~73.94%)、富钾(K_2O=4.24%~4.88%,K_2O/Na_2O=1.23~1.44)、富铁(TFe_2O_3=2.10%~3.70%,TFe_2O_3/MgO=3.88~6.84)、低镁(MgO=0.31%~0.94%)、低磷(P_2O_5=0.08%~0.21%)的特征,属准铝质、高钾钙碱性系列。香泉正长花岗岩稀土元素含量较高(318×10~(-6)~499×10~(-6)),表现出明显的负Eu异常(δ Eu=0.37~0.46),富集Rb、Th、Zr、Sm、Ga(10000×Ga/Al=2.59~2.93)等微量元素,贫Ba、Nb、Ta、Sr,整体表现出A型花岗岩特征。结合区域资料认为,香泉正长花岗岩形成于造山后环境,为低压环境下长英质地壳物质部分熔融成因。 相似文献
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分散元素铊成矿作用的相关研究近年来已经取得了重要进展,但矿床中铊的赋存状态研究仍有待深入.香泉独立铊矿床位于长江中下游成矿带北侧的皖东地区,该矿床中铊的赋存状态研究对拓展铊元素成矿研究具有重要意义.本文通过矿相学、微量元素地球化学、电子探针分析和X射线粉晶分析等方法,确定了香泉铊矿床中黄铁矿是铊的主要载体矿物.铊在黄铁矿中主要以类质同象形式替代铁进入黄铁矿晶格,其次以纳米级、次纳米级铊矿物颗粒形式产出. 相似文献
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安徽和县香泉独立铊矿床的地质地球化学特征及成因探讨 总被引：7，自引：2，他引：7
安徽和县香泉铊矿床位于长江中下游成矿带北侧的皖东地区,是目前为止发现的罕见独立铊矿床。和县地区位于扬子板块、华北板块和大别造山带之间的过渡带,区内无岩浆岩出露。矿床的赋矿围岩为奥陶系下统仑山组微晶灰岩、泥灰岩和泥岩,主要控矿构造为断裂和褶皱。矿床主要由一个矿体组成,矿体总体上为似层状和透镜状,分布与地层走向大体一致。矿床中铊高度富集,黄铁矿是铊的主要载体矿物,铊主要以类质同象形式替代铁进入黄铁矿晶格,其次以纳米级、次纳米级铊矿物颗粒形式产出。矿床的围岩主要蚀变类型有萤石化、重晶石化、硅化和碳酸盐化等。矿床的地质地球化学特征研究表明,铊矿床的形成经历了两个成矿期,即海底热水沉积成矿期和低温热液改造成矿期。奥陶纪海底热水形成含铊黄铁矿建造,早白垩纪低温成矿流体对黄铁矿建造进行叠加改造,并使铊进一步活化富集。香泉铊矿床的发现和研究表明,分散元素铊不仅可以富集形成伴生型多元素矿床,还可以形成单一元素的独立铊矿床。 相似文献
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A preliminary investigation and evaluation of the thallium environmental impacts of the unmined Xiangquan thallium-only deposit in Hexian,China 总被引：7，自引：0，他引：7
Taofa Zhou Yu Fan Feng Yuan David Cooke Xin Zhang Liangjun Li 《Environmental Geology》2008,54(1):131-145
The Xiangquan Thallium-only deposit in Hexian, east China is a newly found near-surface and unmined shallow-seated thallium
deposit. The 250t Tl deposit is hosted in Lower Ordovician Lunshan Group as lenticular and confined by northeast F1, F2 faults.
The metallic minerals are dominated by pyrite, more than 95% Tl occurs in pyrite as tiny individual grains or as ‘‘invisible
thallium”. Tl and other trace elements pollution in ecosystems such as soils, surface and ground waters and water sediments,
plants and crops, and animal and human beings in Xiangquan near the Tl ore deposit have been investigated and evaluated. Results
show that Tl as well as As and Sb in ecosystems in Xiangquan around the deposit have enriched, they came from Tl-pyrite in
the ore bodies and in the parent rocks of weathered soils on top of the ore bodies and went into the nearby ecosystems through
weathering, leaching and dissolving. In 2 km2 around the Xiaolongwang Mountain where the Tl ore deposit seated, soils, vegetables, crops have been polluted or heavily
polluted by Tl, As and Sb. Farmlands near the ore body are not fit to grow vegetables and crops. Thermal Spring water in Xiangquan
town and pond water close to the Tl deposit are not potable. Tl also enriches in human hair and urinate of villagers who live
close to the Tl deposit. Even through the Tl-only deposit has put clear environmental impacts on the local environment and
ecosystems around it, no serious consequences of Tl pollution have so far taken place due to unmining of the Tl deposit as
well as the screen effect of the silicficious breccia cap on top of it. All this work adds new knowledge to understand Tl
behavior in unmined Tl deposit, and also benefit to the local environmental protection and the future mineral resources exploration. 相似文献
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