中国大陆科学钻主孔超高压变质岩中钛的矿化作用
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本文为中国大陆科学钻探(CCSD)工程项目、国家973项目(编号 2003CB716507) 资助的成果。


Titanium Mineralization of the Ultrahigh~Pressure Metamorphic Rock: Based on the Chinese Continental Scientific Drilling 5158 m Main Hole
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    摘要:

    在对位于苏北榴辉岩分布区的中国大陆科学钻探工程5158m主孔岩芯进行编录、岩矿鉴定及测试的过程中,对主孔岩芯的钛矿化进行了研究。主要有经济价值的含钛相是金红石,其次是钛磁铁矿。主要含矿岩石是普通金红石榴辉岩,石英金红石榴辉岩,金红石/钛铁矿石榴辉石岩,其次有多硅白云母金红石榴辉岩,蓝晶石金红石榴辉岩,金红石黑云绿帘纤闪石岩(退变石榴辉石岩)。根据不同的矿化程度和岩性组合,将整个主孔大致分为三大岩性段: ① 0~2038m:为主孔各类榴辉岩主要产出、钛矿化最好、厚度最大的地段; ② 2038~3597m:为主孔钛矿化贫化、分布零散、厚度较薄的岩性段,含13层矿化视厚度4~37m不等的退变~强退变的榴辉岩,主要围岩是榍石钛铁矿钛磁铁矿黑云角闪长英质片麻岩以及含白钛矿钛磁铁矿二长片麻岩,构造糜棱岩化或碎裂~角砾岩带发育,其中常见大小不等、晶簇状生长的石英方解石脉体和晶洞; ③ 3597m~终孔:主要为糜棱岩化强弱不同的含钛磁铁矿黑云角闪长英质片麻岩和糜棱岩化角闪黑云二长片麻岩夹角闪黑云片岩,无榴辉岩。但在3577~5150m发现了大量富含稀土矿物的脉体。主孔岩石类型主要有6种: 榴辉岩类,榴辉岩质片麻岩,石榴单辉橄榄岩,二长片麻岩和长英质片麻岩,纤闪石化辉石岩,碎裂岩和糜棱岩类。含钛矿物有金红石,钛铁矿,榍石,钛斜硅镁石,白钛矿及少量锐钛矿,板钛矿。矿石类型可分为13类。文章阐述了含钛相矿物学、金红石化学成分及微量元素特征以及金红石的成矿地球化学特征;讨论了超高压变质成矿及钛物质来源于罗迪尼亚超大陆形成后的新元古代裂解事件中的地幔柱的成矿模式。

    Abstract:

    Titannium mineralization was studied during the investigation on more than 5158 m of the drill core rocks from the Chinese Continental Scientific Drilling (CCSD),it is found that the most important economic titanium mineral is rutile and then followed by titanomagnetite. The major titaniumbearing rocks are:common rutile eclogite ,quartz rutile eclogite,and rutile/ VTimagnetite eclogite; while phengite rutile eclogite,kyanite rutile eclogite and rutile biotite epidote uralitic rock (retrograded garnet pyroxenite) are the minor orebearing rocks. Based on the mineralization degree and rock assemblages, the lithology can be divided into three sections as follows: ① 0~2038m: the major occurrences for various kinds of eclogites with the most intensive titanium mineralization and largest in eclogite thickness of the main hole ; ② 2038~3597m: the thinbedded, poorly mineralized section of the hole, with a sporadic distribution, contains 13 of retrograded and highly retrograded eclogites with thicknesses ranging from 4 to 37 meters. Main country rocks are sphene, ilmenite, titano magnetite, biotite amphibolefelsicgneiss,and titanomagnetitebearing monzonitic gneiss, with welldeveloped shear zones composed of both mylonites and cataclasite breccia belts within them various sized druse and veinlets of quartz and calcite are common;③ 3597 to the end of the hole: composed mainly of variouslymylonitized titanomagneititebearing biotite amphibole felsic gneiss and mylonitized amphibole biotite monzonitic gneiss intercalated with amphibole biotite schists, without eclogite below 3597 m. However, a great amount of veinlets containing REE minerals were found between 3577 an 5140 m of the hole. Six types of rocks including eclogite and 13 type of ores were recognized, this study mainly focuses on the mineralogy of the titanium minerals,the trace element of rutile,the geochemistry characteristics of rutile mineralization and evolution of titanium mineral in every stages. It is suggested that ultrapressure metamorphic minerals and titanium originated from the mantle plume resulting from the Neoprotorozoic Rodinia supercontinent breakup event.

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徐珏,王登红,陈毓川,陈振宇,余金杰,傅旭杰,王平安,李晓峰,李纯杰.2008.中国大陆科学钻主孔超高压变质岩中钛的矿化作用[J].地质学报,82(5):612-624.
.2008. Titanium Mineralization of the Ultrahigh~Pressure Metamorphic Rock: Based on the Chinese Continental Scientific Drilling 5158 m Main Hole[J]. Acta Geologica Sinica,82(5):612-624.

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  • 收稿日期:2007-11-25
  • 最后修改日期:2008-02-12
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