Petrology of Ortsog-Uul peridotite-gabbro massif in Western Mongolia

M. Shapovalova, N. Tolstykh, R. Shelepaev, M. Cherdantseva

Результат исследования: Научные публикации в периодических изданияхстатья по материалам конференции

Аннотация

The Ortsog-Uul mafic-ultramafic massif of Western Mongolia is located in a tectonic block with overturned bedding. The massif hosts two intrusions: a rhythmically-layered peridotite-gabbro association (Intrusion 1) and massive Bt-bearing amphibole-olivine gabbro (Intrusion 2). Intrusions 1 and 2 have different petrology features. Early Intrusion 1 (278±2.5Ma) is characterized by lower concentrations of alkalis, titanium and phosphorus than late Intrusion 2 (272±2Ma). The chondrite-normalized REE and primitive mantle-normalized rare elements patterns of Ortsog-Uul intrusions have similar curves of elements distribution. However, Intrusion 2 is characterized higher contents of REE and rare elements. High concentrations of incompatible elements are indicative of strong fractionation process. It has been suggested that Intrusions 1 and 2 derived from compositionally different parental melts. Model calculations (COMAGMAT-3.57) show that parental melts of two intrusions were close to high-Mg picrobasaltic magmas. The concentration of MgO in melt is 16.21 (Intrusion 1) and 16.17 (Intrusion 2). Isotopic data of Ortsog-Uul magmatic rocks exhibit different values of ϵNd (positive and negative) for Intrusion 1 and 2, respectively.

Язык оригиналаанглийский
Номер статьи012020
Число страниц6
ЖурналIOP Conference Series: Earth and Environmental Science
Том110
Номер выпуска1
DOI
СостояниеОпубликовано - 3 янв 2018

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