Geochronologic constraints on syntaxial development in the Nanga Parbat region, Pakistan

Article Abstract:

Geochronologic data from the Nanga Parbat-Haramosh Massif (NPHM), NW Pakistan, reveal high denudation and cooling rates for the NHPM over the past 10 million years (m.y.). Two phases of metamorphism over a period of 50 m.y. are also revealed for the NHPM. The initial phase of high pressure metamorphism was due to obduction of the Kohistan terrane. The following decompression metamorphism, at 3.3-4.0 Ma, resulted due to rapid denudation. The overall cooling age pattern within the massif gives an idea about the syntaxial growth and folding and faulting in the Nanga Parbat region.

Geology, Structural, Structural geology, Metamorphism (Geology)

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Comparison of clastic wedge provenance in the Appalachian foreland using U/Pb ages of detrital zircons

Article Abstract:

The use of sensitive high-resolution ion microprobe (SHRIMP) allows the determination of U/Pb ages of zircons in quartz clasts from two Appalachian clastic wedges. This helps in understanding the provenance and tectonic history of the central Appalachian basin. Zircons from the Shawangunk quartz pebbles yield Grenville ages of 950-1200 Ma. This indicates that the Taconic orogeny caused uplift, unroofing and erosion of the Grenville basement. Zircons from Pottsville quartz clasts range in age from 380 Ma to 2100 Ma, thereby, suggesting possible derivation from multiple sources.

Usage, Appalachian Mountains, Zircon, Quartz, Inclusions, Microprobe analysis

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Crustal reworking at Nuaga Parbat, Pakistan: Metamorphic consequences of thermal-mechanical coupling facilitated by erosion

Article Abstract:

Research investigating the metamorphic implications of the mechanical-thermal coupling processes taking place in Nanga Parbat, in Pakistan, following erosion is presented. Particular attention is given to geological aspects of the Himalayan area.

Pakistan, Erosion, Heat budget (Geophysics), Heat budget (Physics), Himalaya Mountain Region

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