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• W2077348009 abstract "Nineteen 40 Ar/ 39 Ar and 22 Rb‐Sr mineral ages are presented for metamorphic rocks and granites collected from the northern part of the Nanga Parbat‐Haramosh Massif (NPHM) and adjacent parts of the Kohistan arc, western Himalaya. The majority of these ages are interpreted as exhumation‐related cooling ages, and they therefore place important constraints on the exhumation history of the region. The 40 Ar/ 39 Ar and Rb‐Sr mica cooling ages for areas of the NPHM to the north of the Indus River lie in the range 2–8 Ma and are similar to previously published ages from the Indus gorge itself. Cooling histories for these areas show little systematic variation from east to west, suggesting that the basement may have been exhumed as a relatively rigid block, after the main stages of folding. Mica ages increase dramatically from the NPHM westward into the Kohistan arc, where ages lie in the range 13–30 Ma. The contrast in both cooling ages and the age differential between mineral pairs between the two terranes indicates rapid cooling of the NPHM in the last 10 m.y. compared with the Kohistan arc. The relationship between rates of cooling and exhumation is poorly constrained in regions of rapid uplift, where the characteristics of the evolving geotherm are not well understood. However, the results are consistent with an anomalously rapid exhumation history of the NPHM during the last 10 m.y. compared with the adjacent Kohistan arc. The interpretation of some of the ages documented in this study is problematical. Two biotite samples from contrasting lithologies within the NPHM have yielded higher 87 Sr/ 86 Sr ratios than the corresponding whole rocks, but the cause of this isotopic disequilibrium remains unclear. Other biotite samples from the region have consistently yielded younger Rb‐Sr ages than 40 Ar/ 39 Ar ages, which may be a reflection of either preferential leaching of 87 Sr during fluid infiltration on a regional scale or the presence of excess argon. Alternatively, the relative ages indicate slightly lower closure temperature for strontium diffusion in biotite than for argon diffusion in biotite where samples have undergone rapid cooling." @default.
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• W2077348009 date "1995-04-01" @default.
• W2077348009 modified "2023-10-15" @default.
• W2077348009 title "Isotopic constraints on the cooling history of the Nanga Parbat‐Haramosh Massif and Kohistan arc, western Himalaya" @default.
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• W2077348009 doi "https://doi.org/10.1029/94tc02906" @default.
• W2077348009 hasPublicationYear "1995" @default.
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