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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Application of titanium-in-quartz geothermometry to magmatic quartz in evolved rocks from the Bushveld Complex, South Africa
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Application of titanium-in-quartz geothermometry to magmatic quartz in evolved rocks from the Bushveld Complex, South Africa

机译：南非灌木丛岩石岩石岩石岩石石英的应用

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摘要

We report concentration data for the trace element titanium (Ti) in magmatic quartz in eight samples of leucogabbronorite, anorthosite, olivine ferrodiorite and quartz anorthosite from the Main and Upper Zones of the Bushveld Complex. The results, obtained by electron microprobe analysis, were used with Ti-in-quartz geothermometers (TitaniQ) to constrain the solidus temperatures of these rocks. Magmatic quartz is present sporadically in the mafic cumulate rocks of the 2950 m Bellevue borehole (Northern Limb), and commonly occurs as intercumulus, triangular patches, typically between cumulus feldspars and pyroxenes, suggesting that it crystallized late, from trapped interstitial melts. Quartz grains in rutile-bearing samples (implying TiO_2 activity = 1) 2 yield Ti concentrations of 48 to 106 ppm that constrain the solidus temperatures of the Bellevue cumulate rocks at T= 677 to 767oC, using a calibration of the pressure-sensitive geothermometer at 3 kbar, thought to represent the emplacement pressure of the mafic cumulate rocks. These results imply a mean solidus temperature for Bushveld cumulate rocks of approximately 732 ± 31oC (n = 7). Cathodoluminescence imagery (CL) of quartz from the studied samples reveals a variety of textures that correlate with Ti content, and hence temperature. These include rim-tocore (RC) zoning, homogeneous CL intensity and some samples show irregular patches of variable CL intensity. The observed zoning can be interpreted as intercumulus quartz grains that crystallized from their rims inward towards their cores.
机译：从Bushveld复合物的主要和上部区域报告八岩石英中岩浆石英中的磁性石英中的微量元素钛（Ti）的浓度数据。通过电子微探剂分析获得的结果与Ti-intz地热测定仪（Titaniq）一起使用，以限制这些岩石的固相温度。 Magmatic石英在2950 m Bellevue钻孔（Northern Limb）的麦克风累积岩石中偶尔呈现出摩西累积的岩石，并且通常作为腹腔，三角形斑块，通常在积云和辉石之间发生，这表明它已故结晶，从被困的间质熔体开始结晶。金刚石的样品中的石英粒（暗示TiO_2活性= 1）2产生48至106ppm的Ti浓度，其使用压敏地热计的校准约束百叶斑累积岩石的固定温度累积岩石岩的固定温度。 3 kbar，思想代表MAFIC累积岩石的施加压力。这些结果意味着Bushveld累积岩石的平均固定温度约为732±31oC（n = 7）。来自研究样本的石英的阴极发光图像（CL）揭示了与Ti含量相关的各种纹理，因此温度。这些包括RIM-Tocore（RC）分区，均匀的Cl强度和一些样品显示出不规则的可变CL强度的斑块。观察到的分区可以被解释为中间石英颗粒，其从其轮缘向内朝向它们的核心结晶。

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