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The sedimentary environment and source of ore-forming materials of sandstone-type copper deposits in southeast Kuqa Basin, Xinjiang, China
Entorno sedimentario y fuente de materiales formadores de minerales de depósitos de cobre tipo arenisca en el sureste de la cuenca de Kuqa, Xinjiang, China
DOI:
https://doi.org/10.15446/esrj.v29n1.117846Keywords:
Kuqa Basin, sandstone-type copper deposit, LA-ICP-MS, sedimentary environment (en)Cuenca Kuqa, depósitos cupríferos de tipo arenisca, ambiente sedimentario (es)
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A series of sandstone-type copper deposits and occurrences are distributed in the Kuqa Basin, Xinjiang. Based on field surveys, authors researched the sedimentary environment and metallogenic model of copper deposits southeast of the basin. The relationship between the sedimentary environment/facies in the area and the copper mineralization was summarized to explore the genesis of mineralization and the metallogenic model. We identified main sedimentary facies types of alluvial fans, fan deltas, and lakes in the Neogene strata, and further identification of five subfacies and seven microfacies was made. Our research results reveal that the genesis of sandstone-type copper mineralization is related to the sedimentary environment, and the mineralized bodies are mainly distributed in fan delta plain facies and fan delta front facies. Detrital zircon dating results of two samples from Kangcun area are 427.4 ± 6.6 Ma, 387.3 ± 3.3 Ma and 424.6 ± 2.3 Ma, 279.9 ± 6.8 Ma.The other two samples from Duwanke area are 285.6 ± 3.0 Ma, 449.5 ± 3.2 Ma and 427.5 ± 2.3 Ma. It indicates that the source of the copper-bearing sandy conglomerate in the Miocene Jidike Formation (N1j) is mainly from the strata and magmatic rock products formed by the geological evolution during the Late Silurian to Early Permian.
Una serie de depósitos y ocurrencias de cobre de tipo arenisca se distribuyen en la cuenca de Kuqa, Xinjiang. Basado en observaciones de campo los autores realizaron esta investigación del ambiente sedimentario y del modelo metalogénico de los depósitos de cobre en sureste de la cuenca. La relación ambiente/facies sedimentaria en el área y la mineralización cuprífera fueron sintetizada para explorar el origen de los modelos de mineralización y metalogenia. Los autores identificaron los principales tipos de facies sedimentarias de los abanicos aluviales, deltas en abanico y lagos en los estratos neógenos, y se realizó una identificación adicional de cinco subfacies y siete microfacies. Los resultados de la investigación revelan que el origen de la mineralización cuprífera tipo arenisca se relaciona con el ambiente sedimentario y que los cuerpos mineralizados se distribuyen principalmente en facies de llanura deltaica y facies de frente deltaico. Los resultados de datación con circón detrítico de dos muestras del área de Kangcun presentan los rangos de 427.4 ± 6.6 Ma, 387.3 ± 3.3 Ma y 424.6 ± 2.3 Ma, 279.9 ± 6.8 Ma. Las otras dos muestras del área de Duwanke estan entre 285.6 ± 3.0 Ma, 449.5 ± 3.2 Ma y 427.5 ± 2.3 Ma. Esto indica que la fuente del conglomerado arenoso de contenido cuprífero en la formación Jidike del Mioceno proviene principalmente de los estratos y productos de roca magmática formados por la evolución geológica durante el Silúrico Tardío al Pérmico Temprano.
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