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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:①0~2038m:为主孔各类榴辉岩主要产出、钛矿化最好、厚度最大的地段;②2038~3597m: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;③3597m~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。
During the cataloging, rock identification and testing of the 5158m main core of the Chinese mainland scientific drilling project located in the North Jiangsu eclogite distribution area, the titanium mineralization of the main core was studied. The major economically valuable titanium-containing phase is rutile, followed by titanium magnetite. The main ore-bearing rocks are common eclogite eclogite, quartz eclogite eclogite, rutile / ilmenite eclogite, followed by polycrystalline mica-garnet emerald, kyanite eclogite eclogite, rutile black Cloud green bolt amphibole (degenerate garnet pyroxene). According to different degrees of mineralization and lithology, the whole main hole can be roughly divided into three major lithologies: ①0 ~ 2038m: the main output of all types of eclogite, the area with the best titanium deposit and the largest thickness; ②2038 ~ 3597m: the main hole titanium mineralization depleted, fragmented, thin thickness of the lithological section, with 13 layers of mineralized depending on the thickness of 4 ~ 37m ranging from degeneration ~ strong degenerate eclogite, the main Wai The rock is a columbite-ilmenite-titanomagnetite-biotite dioritic gneiss and a titanomagnetite-bearing gneiss in the form of mylonitization or fragmentation ~ breccia Rock zone development, in which the common size, cluster growth of quartz calcite veins and crystal cave; ③ 3597m ~ final hole: mainly mylonitized strength of different titaniferous magnetite horny diorgancyloxene Gneiss and mylonitization hornblown dark cloud two long gneiss angle flashed biotite schist, no eclogite. However, in 3577 ~ 5150m, a large number of veins rich in rare earth minerals were found. There are six main types of rock types in the main-hole: eclogite, eclogite-gneiss, plutonium-peridotite, gneiss and feldspathic gneiss, Rocks and mylonites. Titaniferous minerals are rutile, ilmenite, gallite, titanosite, white titanium and a small amount of anatase, brookite. Ore types can be divided into 13 categories. In this paper, the characteristics of the mineralogy, the chemical composition and the trace elements of the rutile, the characteristics of the trace elements and the metallogenic geochemical characteristics of the rutile are expounded. The discussion of the metamorphic and ultrahigh-pressure metamorphism and the origin of the titanium from the Neoproterozoic pyrolysis Metallogenic model of mantle plumes in the event.