Provenance of the Late Triassic-Early Jurassic Gano bauxite deposit in Alborz Orogen, Northern Iran: A multi-proxy geochronological approach by detrital zircon and rutile

IF 2.5 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Jintao Zhou , Maryam Khosravi , Wenchao Yu , Guangyan Zhou , Hao Deng
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Abstract

A significant Eo-Cimmerian unconformity developed during the Late Triassic-Early Jurassic in the Alborz Orogen, Iran, resulting in the formation of bauxite on the surface of carbonate rocks. Provenance analysis of such bauxite can help understand the Tethyan tectonic evolution, but strong geochemical weathering eliminates most geochemical information for source tracing. The multiproxy geochronology method is emerging for bauxite provenance studies and remains unexplored in Iran. Here, we supplemented a multi-proxy approach (detrital zircon and rutile) with zircon trace elements, Hf isotopes, and machine learning methods to constrain the provenance of Gano bauxite in the Alborz Orogen. New data present a dominant zircon age cluster (250–200 Ma), indicating magmatic provenance from the Alborz Orogen. The Semi-supervised Random Forest algorithm indicates a transition from S-type to A-type granites as detrital zircon sources. This shift correlates with the initial collision of the Central Iran and Eurasia blocks, likely occurring during the Late Triassic Carnian stage (≥ ∼231 Ma). Two rutile age groups (1100–500 Ma and 500–400 Ma) indicate local recycled basement contributions. These two types of provenance were deposited in a foreland basin and underwent bauxitization in the Late Triassic-Early Jurassic. Zircon and rutile UPb ages in Gano bauxite show a young, near-unimodal zircon age spectrum with several older rutile age fractions, reflecting provenance fertility imbalance in the active continental margin. The application of detrital zircon alone for bauxite provenance analysis in active continental margins is constrained. Employing diverse detrital accessory minerals could better clarify the complex origins.
伊朗北部Alborz造山带晚三叠世—早侏罗世甘诺铝土矿床物源:由碎屑锆石和金红石组成的多代年代学研究
伊朗Alborz造山带晚三叠世-早侏罗世发育了一次重要的始-西米叠世不整合,导致碳酸盐岩表面形成铝土矿。这类铝土矿的物源分析有助于了解特提斯的构造演化,但强烈的地球化学风化作用使大部分地球化学信息无法用于溯源。多代理地质年代学方法正在兴起,用于铝土矿物源研究,但在伊朗尚未开发。在这里,我们用锆石微量元素、Hf同位素和机器学习方法补充了多代理方法(碎屑锆石和金红石),以限制奥尔博斯造山带Gano铝土矿的来源。新资料显示锆石年龄群(250 ~ 200 Ma)占主导地位,表明岩浆物源来自奥尔博斯造山带。半监督随机森林算法表明碎屑锆石源由s型花岗岩向a型花岗岩过渡。这种转变与伊朗中部和欧亚大陆地块的初始碰撞有关,可能发生在晚三叠世卡尼期(≥~ 231 Ma)。两个金红石年龄组(1100 ~ 500 Ma和500 ~ 400 Ma)反映了当地的再生基底贡献。这两种物源均沉积于前陆盆地,并在晚三叠世—早侏罗世经历了铝土矿化作用。Gano铝土矿的锆石和金红石UPb年龄呈现出较年轻的近单峰锆石年龄谱,其中有几个较老的金红石年龄谱,反映了活动大陆边缘物源肥力的不平衡。单独的碎屑锆石在活动大陆边缘铝土矿物源分析中的应用受到限制。采用多样化的碎屑副矿物可以更好地厘清复杂的成因。
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来源期刊
Lithos
Lithos 地学-地球化学与地球物理
CiteScore
6.80
自引率
11.40%
发文量
286
审稿时长
3.5 months
期刊介绍: Lithos publishes original research papers on the petrology, geochemistry and petrogenesis of igneous and metamorphic rocks. Papers on mineralogy/mineral physics related to petrology and petrogenetic problems are also welcomed.
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