The garnet amphibolite schist is associated with the gabbroic unit of Mawat ophiolite, Kurdistan region, Northeast Iraq, in imbricated zone Zagros orogenic belt. Field observation, petrographic study, mineral chemistry, geochemical data, and thermodynamic modeling were used to demonstrate identification, predict observed stable assemblages, validate protolith. assemblages prograde are (pyrope-a...

The Tuwu porphyry copper deposit is located on the Dananhu-Haerlik island arc in eastern Tianshan, NW China. Based geology, petrology, and situ trace element studies of pyrite chlorite, we redefined characteristics hydrothermal fluids following three mineralization stages: premineralization stage (stage Ⅰ), metallogenic Ⅱ), superimposed transformation Ⅲ). Pyrite Ⅰ (Py-I) has highest Co/Ni ratio...

Located in the southern margin of Central Asian orogenic belt, stratigraphy and tectonic setting mafic 290−280 Ma Liuyuan Complex have been controversial for decades, with workers arguing a forearc ophiolite or continental rift setting. Here, we present results detailed field study, where was subdivided into troctolite, melatroctolite, layered gabbro, varitextured olivine hornblende plagiograni...

The Harla gold deposit is located on the eastern segment of Kanggur-Huangshan ductile shear belt in Eastern Tianshan, southern margin Central Asian Orogenic Belt. orebodies show close spatial association with NEE-trending faults and are hosted volcanic rocks Lower Carboniferous Xiaorequanzi Formation. Three mineralization stages were recognized: an early stage characterized by specularite–pyrit...

The Chenaillet ophiolite, South of Montgenèvre (France), represents a preserved portion the alpine ocean. gabbros form lenticular bodies 50 to 200 m thick and few hundreds meters wide. They are intrusive in serpentinites often overlain by pillow-lavas. Plagiogranite/albitite veins rare volumetrically negligible. petrology gabbro s.s. show great details progressive cooling massif, clinopyroxene ...

introduction geological background ophiolites have played a major role in our understanding of earth’s processes ranging from seafloor spreading, melt evolution and magma transport in oceanic spreading centers, and hydrothermal alteration and mineralization of oceanic crust to collision tectonics, mountain building processes, and orogeny. they provide the essential structural, petrological, geo...

7 The Unst Ophiolite is the best exposed of a chain of early Ordovician ophiolites in the 8 Scottish Caledonides and is widely regarded as having formed in a supra-subduction zone 9 setting within the Iapetus Ocean. Reinterpretation of sheeted dykes suggests that it formed 10 as an oceanic core complex, presumably during subduction roll-back immediately prior to 11 obduction onto the Laurentian...