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虎皮峪条痕状花岗质岩石特征及成因探讨 总被引:2,自引:0,他引:2
目前,对辽东营口虎皮峪地区早元古宙条痕状花岗质岩石成因有两种认识,一是认为属混合交代成因;二是认为属幔源岩浆型花岗岩。作者通过对虎皮峪条痕状花岗质岩体地质特征,岩石学及岩石地球化学研究,认为虎皮峪条痕状花岗质岩石为重熔型花岗岩。形成于辽河旋回,是辽河群下部火山—沉积岩在热动力作用下发生重熔形成再生岩浆,然后就地固结或沿着地壳薄弱部位上侵形成岩浆型花岗岩,具有S型花岗岩特征 相似文献
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北票二道沟金矿床岩石稀土元素特征表明,其岩浆岩岩源均属上地幔。金矿母岩是来自上地幔不同部位的岩浆侵入岩石,金矿化与多次岩浆热液有关。 相似文献
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胶东地区是世界著名的金矿资源基地,截至2023年6月已累计探明金矿资源量已达5757余吨。与金矿成矿密切的中生代花岗岩分布广泛,岩石类型多样,也是山东省最发育、最典型的地区。本文对胶东地区金矿与中生代区域性花岗岩空间展布、形成时代和形成环境等关系进行了分析研究。区域性广泛分布的中生代花岗岩为晚侏罗世玲珑期(166~146Ma)、早白垩世早期郭家岭期(135~123Ma)、早白垩世晚期伟德山期(123~110Ma)和崂山期(118~108Ma),研究认为区域性岩浆事件一般持续10Ma左右,而重熔型花岗岩一般持续20Ma,反映了由基底岩石熔融到侵入结晶的2个阶段,它有一个由基底固体岩石熔融的过程,大致也需要10Ma,既固体岩石熔融10Ma,熔浆活动上侵结晶10Ma。玲珑期重熔型花岗岩是扬子板块和华北板块碰撞的期后产物,郭家岭期岩浆事件代表了中国东部中生代构造体制转换的开始,伟德山期岩浆事件代表了构造体制转换的高峰期,崂山期岩浆事件代表了构造体制转换的结束期。86.8%的金矿赋存在玲珑期花岗岩中,6.9%的金矿赋存于郭家岭期花岗岩中,玲珑期花岗岩和郭家岭期花岗岩Au元素背景值明显高于伟德山期... 相似文献
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为了解阿尔金南缘在新元古代早期的构造-岩浆事件,选取曼特里克地区亚干布阳花岗质片麻岩进行详细的岩石学、同位素年代学和地球化学研究。结果表明:亚干布阳花岗质片麻岩形成于新元古代青白口纪,锆石U-Pb年龄为(880.3±3.4)Ma;岩石属过铝质、钙碱性系列的镁质花岗岩,轻、重稀土元素分馏明显,Nb、Ta、Zr、Hf等高场强元素亏损,具有典型的地壳重熔型花岗岩特征,其岩浆来源于下地壳角闪岩相基性岩类的部分熔融,形成于同碰撞花岗岩区;阿尔金南缘新元古代早期的构造-岩浆事件可能对应于新元古代Rodinia超大陆汇聚事件,说明塔里木板块和柴达木板块之间在新元古代早期曾经存在板块的汇聚碰撞。 相似文献
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大巴-建设地区太古宙花岗质岩石由英云闪长岩、奥长花岗岩、花岗闪长岩组成,属TTG岩系。地质、岩石学及地球化学特征表明,它们是古深成侵入体,变质程度属绿片岩相。同位素年龄为2443Ma。岩浆来源于陆壳的部分熔融。 相似文献
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依据鲁西地区早前寒武纪花岗质侵入岩普遍具有塑性流变特征和退化变质特征,以及变质作用和变形作用相协调等现象,认为岩体的侵位与变形、变质是同一期构造岩浆作用形成的,是岩浆就位后逐渐冷凝过程中,在持续应力作用下发生的,与后期的地质构造作用无关;固态岩石只能发生脆性变形和局部的脆韧性变形。并从热力场、动力场和化学场的变化趋势对变形、变质作用的制约因素作了简要分析。 相似文献
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片麻状花岗质岩石成因是地质界关注已久的问题。片麻状花岗质岩石多种成因已被公认(程裕淇等,1963,);(袁奎荣,1984,),但对某个具体对象,认识就有很大差异,长期以来争论激烈。如对元宝山、三防(摩天岭)岩体之片麻状花岗质岩石,有的认为是区域混合岩,有的则认为是受应力压碎而成的花岗岩。又如越城岭岩体西部的片麻状岩石,六、七十年代都认为是断裂变质作用产物,而最近广西区调队和江西区调队 相似文献
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通过对成家山金矿矿体地质特征的分析研究,主要目的是总结找矿标志,指导今后找矿。成家山金矿成因类型属岩浆热液金矿床亚类接触交代-热液金矿床,工业类型为含金石英脉型。金矿体的产出严格受次级断裂构造的控制,含矿岩石为碳酸盐化石英脉和构造角砾岩。其找矿标志为构造(次级断裂)标志、岩性(构造角砾岩、碳酸盐化石英脉)标志。 相似文献
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Shibaqinghao gold deposit is situated in the western part of the northern margin of the North China Craton. It is controlled by an E - W trending tectonic zone that is located in the middle unit of Dongwufenzi group which consists of a sequence of greenschist - facies metamorphic rocks in an Archean greenstone belt.In Shibaqinghao gold deposit there are two types of gold ore, a mylonite ore and a quartz vein ore. Mylonite ore bodies were formed during ductile shearing stage in the Early Proterozoic, whereas quartz vein ore bodies might have been formed in the Mesozoic time.Pyrite accompanied with native gold in the mylonite ore has sulpfur of which δ34S values range from - 5.8 to + 0.8 per mil, similar to the values of mantle- derived sulphur. These data suggest that gold in the mylonite ore be derived from the country rocks which originated directly in the upper mantle.Pyrite in quartz vein ore has the δ34 S values between + 3.0 and + 11.0 per mil, similar to the values of some granitic rocks. These facts indicate that the gold in the quartz vein ore is related to some granitic magma generated in the crust.This study revealed that two different mineralization occurred at different geological times and in different environments but in the same place, resuling in the Shibaqinghao gold deposit. 相似文献
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1IntroductionWestern Linyi of Shandong Province is one of the most important gold ore mineralization concen-tration areas. Tongjing skarn type gold copper de-posit, Jinchang skarn type gold copper deposit and Duijinshan porphyry type gold deposit were found in 1960's (Edited committee, 1996). Following the discovery of Guilaizhuang gold ore deposit related to alkaline rocks in 1988, the western Linyi region becomes one of the extensively studied areas of gold deposits in China (Lin etal.,… 相似文献
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Western Linyi of Shandong Province is one of the most important gold ore mineralization concentration areas. Mesozoic gold ore deposits in this area can be subdivided into two types: magmatic hydrothermal and epithermal gold deposits. The occurrences of gold ore bodies are controlled by structures. Related subvolcanic rocks can be subdivided into high potassium calc-alkali series and alkaline series. These two types of subvolcanic rocks are of different geochemical features and different sources. The high potassium calc-alkali rocks are derived from enriched mantle and contribute to the formation of magmatic hydrothermal gold ore deposits including skarn gold-copper ore deposit and porphyry gold ore deposit. Alkaline rocks are derived from lower crust and they host epithermal gold deposits. Comprehensive studies show that there is no evolutionary or transitional relationship temporally and genetically between the epithermal gold deposit and the high temperature magma hydrothermal gold deposit in the western Linyi. 相似文献
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ZHANG Hongying 《东北亚地学研究》2002,(2)
1GeologicSettingShibaqinghaogolddepositissituatedinthewesternpartofthenorthernmarginoftheNorthChinaCraton .ItiscontrolledbyanE -WtrendingtectoniczonethatislocatedinthemiddleunitofDongwufenziGroup ,whichconsistsofasequenceofgreenschist -faciesmetamor phicr… 相似文献
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There are two types of gold ore in Shibaqinghao gold deposit, a mylonite ore and a quartz - vein ore. Pb isotope compositions for mylonite ore are characterized by lower Pb isotope ratios ranging from 16.63 to 17.45 (206Pb/204Pb), 15.31 to15.48 (207Pb/204pb), 36.52 to 38.85 (208Pb/204Pb). They are scattered very close to a model curve of the mantle evolution. These ratios suggest that gold in the mylonite ore might be derived from the country rocks, which originated directly in the upper mantle. Pb isotope compositions for quartz - vein ore are characterized by higher Pb isotope ratios ranging from 18.23 to 19.74 (206Pb/204Pb), 15.69 to 15.89 (207Pb/204Pb), 38.64 to 40. 13 (208Pb/204Pb). They are scattered very close to a model curve of the upper crustal evolution. These facts indicate that the gold in the quartz - vein ore might be related to some granitic magma generated in the crust. 相似文献
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通过对广西那坡县果提金矿床所处的地质构造条件,区域物化探异常特征及矿石矿物组分、结构构造等方面进行初步研究,得出该金矿床系断裂构造控矿、金矿质来源于矿区深部中酸性岩浆的结论。 相似文献