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首页> 外文期刊>International Journal of Earth Sciences >Employing geochemistry and geochronology to unravel genesis and tectonic setting of iron oxide‑apatite deposits of the Bafq‑Saghand metallogenic belt, Central Iran
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Employing geochemistry and geochronology to unravel genesis and tectonic setting of iron oxide‑apatite deposits of the Bafq‑Saghand metallogenic belt, Central Iran

机译：用地球化学和地质学报，以伊朗中部伊朗中央施工中的氧化铁 - 磷灰石沉积物的解开创世纪和构造环境

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The Bafq-Saghand metallogenic belt is located in the central part of the Kerman-Kashmar tectonic zone and contains 39 individual occurrences of iron oxide-apatite +/- REE mineralizations. These mineral concentrations, e.g., Chadormalu, Choghart, Sechahun, and Esfordi, comprise a total of similar to 1500 million tons of iron ore with an average grade of similar to 55% Fe. In terms of origin, time, and geodynamic setting, several modes of formation have been suggested for these ore deposits, including magmatic, hydrothermal, and banded iron formation scenarios. In the present study, the tectonic setting and metallogeny of iron oxide-apatites of the Bafq-Saghand belt are investigated utilizing trace element geochemistry, age dating, and oxygen isotope analyses. The geochemical characteristics of apatite and magnetite and the delta O-18 values of magnetite (from - 0.1 to + 2.2 parts per thousand) indicate a dominantly magmatic-hydrothermal (delta O-18 + 0.9 parts per thousand) formation process, although primary magmatic mineralizations were locally leached and hydrothermally redeposited (e.g., samples with delta O-18 + 0.9 parts per thousand). The Cambrian volcano-sedimentary host rocks to the mineralization is intruded by calc-alkaline tonalite, trondhjemite, granodioritic, dioritic, and granitic rocks that formed in association with subduction of the Proto-Tethys Ocean under the Gondwana supercontinent in the Neoproterozoic to Early Cambrian (525-547 Ma). Additionally, a later geodynamic episode produced intrusions of alkaline syenite and monzosyenite bodies during a continental rifting event. We provide new geochronological constraints for these younger alkaline igneous rocks that document a temporal range from 421 to 447 Ma for their intrusion. In combination with the previously reported overlapping ages of the older calc-alkaline magma bodies (525-547 Ma) with the volcano-sedimentary host rock (528 Ma) and the iron oxide mineralization (510-539 Ma), we can now exclude continental rifting as a geodynamic processes that is linked to ore formation in the region. Our results corroborate that the Bafq iron ore mineralization formed during subduction of the Proto-Tethys Ocean under the Gondwana supercontinent in a near surface continental margin setting.
机译：BAFQ-Saghand成矿带位于Kerman-Kashmar构造区的中央部分，含有39个单独的氧化铁 - 磷灰石+/- REE矿化。这些矿物浓度，例如Chadormalu，Choghart，Sechahun和Esfordi，总共类似于15亿吨铁矿石，平均等级与55％Fe相似。在原点，时间和地球动力学环境中，已经提出了这些矿石沉积物的几种形成模式，包括岩浆，水热和带状铁形成场景。在本研究中，利用痕量元素地球化学，年龄阶段和氧同位素分析研究了BAFQ-SAG手带的氧化铁 - 氧化铁 - 氧化铁的构造和矿化。磷灰石和磁铁矿的地球化学特征和磁铁矿的ΔO-18值（来自 - 0.1至+ 2.2份）表明虽然主要是占主导地位 - 水热（Delta O-18> + 0.9份）的形成过程。岩浆矿化在局部浸出和水热再沉积（例如，样品δO-18 + 0.9份）。寒武纪火山 - 沉积宿主岩石以钙碱铜矿，Trondhjemite，Granodoritic，Diorites和花岗岩岩石侵入，所述花岗岩岩石与Prontwana在Neoproterozoio的Gondwana超级镇联的Proto-Thethys海洋俯冲结合形成，以早期寒武纪（ 525-547 ma）。另外，在大陆渔罗事件期间，后续地质动力学发作产生碱性长氧钛矿和蒙司酯体的入侵。我们为这些较年轻的碱性发出的岩石提供了新的地理学约束，该岩石将时间范围从421到447 mA侵入。与先前报道的较老钙碱岩浆体（525-547 mA）的先前报道的重叠年龄与火山 - 沉积宿主岩石（528 mA）和氧化铁矿化（510-539 mA）相结合，我们现在可以排除大陆剥夺作为地球动力学过程，与该地区的矿石形成相关。我们的结果证实了在近地表大陆边缘设置的吉隆力超大镇定过程中形成的BAFQ铁矿石矿化。

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