适用于喜马拉雅山西部南迦帕尔巴特-哈拉莫什综合地块的铁钛铁矿成因预测模型

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Geophysical Research: Earth Surface Pub Date : 2024-04-29 DOI:10.1029/2023JF007351
Gary O’Sullivan, Elisabeth Scibiorski, Chris Mark
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引用次数: 0

摘要

榍石是一种多功能记录器,可分别通过 U-Pb 系统、Zr-in-Ttn 温度计和元素成分记录结晶年龄、温度和寄主岩性。榍石的副成因使其特别适用于追踪来自岩性的碎屑,这些岩性对于常用的碎屑锆石 U-Pb 天文台来说是贫瘠的,例如钙硅酸盐的亚寒带变质作用。尽管有这些优势,但钛铁矿的非铁屑分析仍未得到充分利用,部分原因是钛铁矿中的 U-Pb 系统往往因在变质反应过程中前驱矿物中的遗传放射性铅和地壳中的大量普通铅而变得复杂。最近对来自不同源岩的大型榍石成分数据集进行的系统分析显示,榍石的元素组成具有来源特异性。在这里,我们将一个包含机器学习分类器的工作流程应用于一个大型且具有代表性的榍石成分数据库,该数据库包含 11,000 项分析结果,其中约 6,700 个点已传递给我们的模型。我们的模型只使用了 205 块岩石的子成分中值。我们对变质榍石和火成岩榍石进行了可靠的区分(90%)。将这一分类方法应用于喜马拉雅山西部南迦帕尔巴特-哈拉莫什合成地块的一个碎屑岩案例研究中,发现不同成分的榍石形成于不同的造山运动。此外,含有大量常见铅的榍石仅来自中/低品位的变质岩。本文介绍的方法为提高榍石来源信息的特异性提供了一条途径;然而,在可靠地实现多类来源岩石判别之前,已公布的榍石数据量必须更大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Predictive Models for Detrital Titanite Provenance With Application to the Nanga Parbat—Haramosh Syntaxial Massif, Western Himalaya

Titanite is a versatile recorder of crystallization age, temperature, and host lithology, via the U–Pb system, the Zr-in-Ttn thermometer, and elemental composition, respectively. The paragenesis of titanite renders it especially useful for tracing detritus derived from lithologies that are infertile for the commonly used detrital zircon U-Pb chronometer, such as sub-anatectic metamorphism of calc-silicates. Despite these advantages, detrital titanite analysis is underemployed, in part because the U–Pb system in titanite is often complicated by the incorporation of both inherited radiogenic Pb from precursor minerals during metamorphic reactions, and also bulk crustal common-Pb. Recent systematic analyses of large titanite compositional data sets from diverse source rocks have revealed that the elemental composition of titanite is provenance-specific. Here, we apply a workflow that incorporates a machine-learning classifier to a large and representative compositional database for titanite, encompassing >11,000 analyses, with c. 6,700 points passed to our model. Only medians of the subcompositions for 205 rocks are used for our model. We reliably discriminate (>90%) between metamorphic and igneous titanite. Application of this classifier to a detrital case study from the Nanga Parbat-Haramosh syntaxial massif of the western Himalaya reveals that titanite of different compositions formed during different orogenic events. Furthermore, titanite with significant common Pb solely derives from medium/low grade metasedimentary rocks. The method described here offers a pathway to increase the specificity of the provenance information derived from titanite; however, the published corpus of titanite data will have to be much larger before multi-class source-rock discrimination can be achieved reliably.

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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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