The dehydration of the lower crust and the assimilation of crustal materials into ascending magmas are two geologic phenomenon which lead to vertical mass transport and potentially, geochemical stratification of continental crust. LOWER CRUSTAL XENOLITHS, KILBOURNE HOLE This integrated Sr-Nd-Pb isotope study of paragneiss xenoliths from Kilbourne Hole maar, New Mexico, is the first of its kind ...

Abstract The petrogenesis and evolution process of continental arc magmatism provide insight into discovering the formation differentiation crust. Therefore, geochemical, isotopic, mineralogical analyses were conducted for coeval igneous rocks in Tengchong Block to clarify their magmatic systems. Middle Triassic appinites Block, southeastern extension Tibet, generated at subduction setting with...

Thickened crust is of great significance for tectonic evolution and mineralization generally occurs in collisional orogenic belts. Whether accretionary belts, such as the Central Asian Orogenic Belt (CAOB), are able to create remarkably thickened crusts what mechanism is, remain be determined. In southwestern CAOB, Eastern Tianshan with broad magmatism integrated arc-continental system an excel...

The Limerick Igneous Suite (LIS) in County Limerick, SW Ireland, contains two distinct basaltic igneous units: the Knockroe and Knockseefin, which are expressed as hypabyssal intrusions, porphyritic dykes, diatremes, lava flows, agglomerates tuffs. These units make up evolutionary trends: range from alkaline basalts to trachyandesites, Knockseefin basanites. U‒Pb dating of apatite establishes a...

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...