In this study, mineralogical and geochemical characteristics of weathered pyroxenites boulders Mamb, Ngong Nkolmbong areas (Pan-African Yaounde group) are determined in order to understand the mineralisation processes Ni, Co, Cr Cu during early stage weathering ultramafic rocks. These intruded micaschist at Mamb or migmatitic gneiss Nkolmbong. Fresh samples made up clinopyroxene, orthopyroxene,...

Luku alkali syenite is distributed throughout the southern end of Hongge basic-ultrabasic intrusion in Panzhihua, Sichuan, SW China. Using LA-ICP-MS, yielded a zircon U-Pb age 264.5 ± 1.6 Ma, concordant with ages E'meishan large igneous province (260 Ma). The displayed silica-saturated, Al-adequate and alkali-rich signatures, SiO2 62.07%–64.04%, Al2O3 16.26%–16.79% Na2O + K2O 9.17%–9.91% (avera...

neyshabour turquoise mine is located in northwest of neyshabour, southern quchan volcanic belt. eocene andesite and dacite forming as lava and pyroclastic rocks cover most of the area. subvolcanic diorite to syenite porphyry (granitoids of magnetite series) intruded the volcanic rocks. both volcanic and subvolcanic rocks are highly altered. four types of alteration are recognized including: sil...

the noorabad-kermanshah ophiolite is part of eastern mediterranean-zagros-oman tethyan ophiolites, that this area is located in south-southwest of the main zagros thrust fault. this ophiolite consists of peridotites, serpentinites and pegmatite gabbros as mantle sequence whereas crustal sequences are composed of locally layered gabbros, isotropic gabbros, sheeted dike complex, basaltic to andes...

The current study presents new geochronological and geochemical data for the Petrovitsa Pb-Zn deposit, Central Rhodopes, South Bulgaria. Based on in-situ U-Pb dating of titanites from pegmatites skarnified mineralized marbles, it aims to provide insights into pegmatite formation their relation hydrothermal system in region. Titanite is an abundant accessory mineral skarns within Madan ore distr...

The debate about whether Eocene magmatism is considered to be post-collisional or subduction-related not still continues. Here we offer new 40 Ar- 39 Ar ad U-Pb zircon geochronology, mineral chemistry, bulk rock and Sr-Nd-Pb isotope geochemistry data obtained from the southern dike (SD) suite, in comparison with northern (ND) Eastern Pontides. geochronological indicate that SD suite erupted bet...