| 川南玄武岩晶洞中的沥青与铜矿物球粒研究 |
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| 引用本文： | 张良钜,胡蕙驿,曾伟来,李东升,曾南石,阮青锋,宋楚欣,覃敏锋.川南玄武岩晶洞中的沥青与铜矿物球粒研究[J].高校地质学报,2015,21(2):177. |
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| 作者姓名： | 张良钜 胡蕙驿 曾伟来 李东升 曾南石 阮青锋 宋楚欣 覃敏锋 |
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| 作者单位： | 桂林理工大学 地球科学学院 |
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| 摘 要： | 川南普格杏仁状玄武岩晶洞中产出大量石英、水晶、沥青、葡萄石以及铜矿物，根据其产状和矿物组合分为石英沥青、水晶-沥青及水晶-葡萄石球粒三种类型晶洞。水晶-葡萄石晶洞中矿物组合具明显球粒形貌特点，球粒由中心柱状 水晶及垂直水晶柱面生长的葡萄石球粒内圈与铜矿物球粒外圈组成。铜矿物球粒具有明显圈层结构，由自然铜核、黑铜矿 幔、硅孔雀石与孔雀石壳组成。野外及镜下观察显示，铜矿物集合体形态受自然铜形状和产出控制，铜矿物球粒主要分布 于多个葡萄石球粒边缘的汇聚处，核部自然铜为球粒状；脉状铜矿物由一向伸长自然铜与黑铜矿、硅孔雀石等矿物组成， 分布于晶洞裂隙中。碳同位素与红外光谱研究表明晶洞中的沥青为生物成因，属石油沥青，有机质可能来自下二叠统 （P13）碳酸盐。晶洞中矿物为含有机质成矿溶液依次结晶而成，其顺序为：玉髓或石英→水晶、沥青与自然铜→自然铜与 葡萄石→黑铜矿→硅孔雀石→孔雀石→方解石。沥青的螺旋生长花纹特征、水晶中包裹体均一化温度以及水晶中沥青与自 然铜之间的关系显示，沥青是有机质（原油）受热裂解转变而成，其形成温度约为290~230℃，自然铜的结晶温度为230~ 160℃。
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| 关 键 词： | 晶洞类型 沥青与自然铜 水晶与葡萄石 形貌与产出 成分与红外光谱 成因 川南普格 |
Study on the Bitumen and Cu-bearing Mineral Spherulite from Basaltic Druse in South Sichuan |
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| ZHANG Liangju,HU Huiyi,ZENG Weilai,LI Dongsheng,ZENG Nanshi,RUAN Qingfeng,SONG Chuxin,QIN Minfeng.Study on the Bitumen and Cu-bearing Mineral Spherulite from Basaltic Druse in South Sichuan[J].Geological Journal of China Universities,2015,21(2):177. |
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| Authors: | ZHANG Liangju HU Huiyi ZENG Weilai LI Dongsheng ZENG Nanshi RUAN Qingfeng SONG Chuxin QIN Minfeng |
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| Institution: | CollegeofEarthScience,GuilinUniversityofTechnology, |
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| Abstract: | Quartz,bitumem,prehniteandCu-bearingmineralswidelyoccurinamygdaloidbasalticdrusefromPugecounty,south Sichuan. According to their occurrences and relationships, three types of basaltic druse are divided: quartz-bitumen druse, rock crystal-bitumendruse,rockcrystal-prehnitedruse.Themineralassemblagesfromrockcrystal-prehnitedrusedisplaythefeatureof nodules, which outward include prismatical rock crystals, prehnite spherulites and Cu-bearing minerals spherulites. Moreover, Cu-bearingmineralsspheruliteshavethefeatureofcirclelayeredstructure,includingnativecopper(core),tenorite(mantle)and chalcostaktite-malachite(crust).Observationsinfieldandundermicroscopeshowthattheshapesandoccurrencesofnativecopper controlthepatternoftheCu-bearingmineralsaggregations.Cu-bearingmineralsspherulitesaremainlydistributedintheconvergences amongtheprehnitespherulites,andthecoreisgranularnativecopper.Cu-bearingmineralsveinsincludestretchnativecopper, tenorite,chalcostaktite,occurinthefracturesofdruses.Thecarbonisotopeandinfraredspectrumsuggestthatasphaltisofbiogenesis andoriginatedfromthecarbonaterocksinPermianstrata(P13).Themineralsinbasalticdrusescrystallizedfromtheorganicfluids,the
commonly recognized sequence is chalcedony → quartz + bitumen+ native copper → native copper + prehnite → tenorite → chalcostaktite→malachite→calcite.Thespiralgrowthpatternsofbitumen,homogenizationtemperatureofinclusionsinquartzand therelationshipsbetweenbitumenandnativecopperinrockcrystalindicatethatbitumenformedunderthethermalcrackingoforganic (crudeoil),thetemperatureis290-230℃.Nativecoppercrystallizedunder230-160℃. |
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| Keywords: | typesofdrus bitumenandnativecopper rockcrystalandprehnite shapeandoccurrences compositionandinfra-red spectrum genesis PugecountyinsouthSichuan |
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