In the Comechingones pegmatitic field, central Argentina, leucogranite and pegmatite bodies crop out in a relatively narrow (25 × 10 km) belt, were emplaced synkinematically with main deformational event of crustal-scale Guacha Corral shear zone during Early Ordovician (~ 475 Ma). These leucogranites pegmatites are geochemically evolved rocks high silica alkalis, low Fe2O3, MgO, TiO2 CaO, ASI v...

The South Mountain Batholith (SMB; Nova Scotia, Canada) is the largest composite batholith exposed in Appalachians and lies entirely within most outboard Meguma terrane. In situ CA–TIMS U–Pb dating isotopes (Lu–Hf, O) geochemistry for zircon from all phases of SMB constrain its source as well evolution. CA–ID–TIMS yields emplacement (autocryst) ages, indicating a transition granodiorite (378.7 ...

Abstract Strongly deformed footwall rocks exposed in metamorphic core complexes (MCC) of the North American Cordillera were exhumed via ductile attenuation, mylonitic shearing, and detachment faulting. Whether these structures accommodated diapiric upwelling or regional extension low‐angle normal faulting is debated. The Ruby Mountains‐East Humboldt Range MCC, northeast Nevada, records top‐west...

A leucogranite sill in the footwall of extensional Pilat shear zone (PSZ) Eastern French Massif Central was emplaced and sheared a short time interval, between 301.8 ± 3.1 303.0 1.6 Ma (zircon U–Pb mica 40Ar/39Ar ages, respectively). Extension ended at 298.5 1.5 (40Ar/39Ar on mica) as shown by non deformed dike cross cutting zone. On hanging wall fault, opening St. Etienne Basin filled coarse c...

Abstract The Twakputs Gneiss is a garnetiferous, K-feldspar megacrystic, biotite granite-granodiorite orthogneiss. It represents major unit in the Kakamas Domain of Mesoproterozoic Namaqua-Natal Metamorphic Province extending about 250 km between Riemvasmaak South Africa and Grünau southern Namibia. occurs as foliation-parallel, sheet-like bodies tightly infolded together with granulite-facies ...

The Marivan granitoid body of the northern Sanandaj–Sirjan Zone (N-SaSZ) northwest Iran was emplaced into Cretaceous sediments, and is associated with minor amounts iron skarn-type mineralization along contact between intrusion surrounding country rocks. granitoids within include (hornblende-rich) diorite, granodiorite, granite phases, zircon U–Pb dating four samples from this indicate they wer...

The Mogok Metamorphic Belt (MMB) in Myanmar is a polymetamorphic, mainly Paleogene granulite-uppermost amphibolite facies terrane consisting of marbles and calc-silicates hosting spinel, ruby sapphire. Jurassic charnockite-syenite intrusions, as well Eocene-Miocene leucogranite intrusions are also present. Pelitic rocks uncommon, where present, have sillimanite, both primary inclusions garnet s...

We summarize our results from Bhutan and interpret the Greater Himalaya Sequence (GHS) of Bhutan, together with a portion of the underlying Lesser Himalaya Sequence, in the context of recently published channel flow models. For the GHS rocks now exposed in Bhutan the depth for beginning of muscovite dehydration melting (approximately 7508C at 11 kbar) and associated weakening of these rocks is ...

The North American Cordilleran Anatectic Belt (CAB) is a ~3,000 km long region in the hinterland of Cordillera that comprises numerous exposures Late Cretaceous to Eocene intrusive rocks and anatectic associated with crustal melting. As such, it comparable size volume major provinces including Himalayan leucogranite belt. CAB are chiefly peraluminous, muscovite-bearing produced primarily by ana...