Compositions of biotite from three different rock types of Mashhad granitoids, i.e., granodiorite, monzogranite and leucogranite in NE of Iran have been documented by electron microprobe and wet chemistry for Fe3+ and Fe2+. Mashhad granitoids have been geochronologically and petrologically grouped into G1 and G2 phases. Microprobe data show that the total Fe contents in biotite from G2 leucogra...

In this presentation questions are raised about a melt-restite unmixing model proposed by Barton and Sidle (1994) for the myrmekite-bearing Waldoboro granite complex along the southeastern coast of Maine (USA). This complex consists mostly of granite/granodiorite gneiss and granite, but smaller masses of quartz diorite, aplite, pegmatite, leucogranite, tourmaline granite, and granite porphyry o...

Infrared spectra (IR) in the O-H stretching region were recorded for natural tourmalines from magmatic and magmatic-hydrothermal systems of Moslavacka Gora (Croatia). Samples disseminated tourmaline (schorl) representing products collected leucogranite. Nodular (intermediate members schorl-dravite series) twomica granite represents a mineral related to final stage crystallization. IR typically ...

compositions of biotite from three different rock types of mashhad granitoids, i.e., granodiorite, monzogranite and leucogranite in ne of iran have been documented by electron microprobe and wet chemistry for fe3+ and fe2+. mashhad granitoids have been geochronologically and petrologically grouped into g1 and g2 phases. microprobe data show that the total fe contents in biotite from g2 leucogra...

Two episodes of late Neoarchean-early Paleoproterozoic and garnet-bearing leucogranite, named the Baotou Jining–Liangcheng leucogranite are recognized from Khondalite Belt in North China Craton. Geochemical studies show that has high Al2O3 content FeOT/MgO ratio, with a large variation CaO K2O/Na2O ratio. Additionally, is enriched light rare earth elements ion lithophile depleted Nb, Ta, P, Ti....

Field mapping and geochronologic and thermobarometric analyses of the Gurla Mandhata area, in southwest Tibet, reveal major middle to late Miocene, east-west extension along a normal-fault system, termed the Gurla Mandhata detachment system. The maximum fault slip occurs along a pair of low-angle normal faults that have caused significant tectonic denudation of the Tethyan Sedimentary Sequence,...