عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
شماره کتابشناسی ملی
شماره
TLpq304249738
زبان اثر
زبان متن نوشتاري يا گفتاري و مانند آن
انگلیسی
عنوان و نام پديدآور
عنوان اصلي
Petrology and stable isotope geochemistry of the Nanga Parbat-Haramosh Massif, northern Pakistan
نام عام مواد
[Thesis]
نام نخستين پديدآور
M. U. K. Khattak
نام ساير پديدآوران
J. W. Shervais
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
University of South Carolina
تاریخ نشرو بخش و غیره
1995
مشخصات ظاهری
نام خاص و کميت اثر
158
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
University of South Carolina
امتياز متن
1995
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
The Nanga Parbat-Haramosh Massif in northern Pakistan records the Tertiary metamorphism and dynamics of the Himalayan collision and subsequent overthrusting of the Asian plate onto the Indo-Pakistan plate. The massif consists of an intercalated sequence of para- and orthogneisses, of minor metabasics and calc-silicate rocks, and of post-metamorphic pegmatite dikes. These gneisses are metamorphosed under high pressure upper amphibolite facies conditions. The P-T estimates and the P-T-t paths of the pelitic samples from the massif and the adjacent areas of the Kohistan and Ladakh arcs along two cross-strike transects (Indus and Astore Rivers) through the massif show that the massif followed a compressional (counterclockwise) and the Kohistan-Ladakh arc a decompressional (clockwise) P-T-t path. Geothermobarometry on zoned garnets from core to rim indicates that the massif rocks started their metamorphic history with 5.5 kb and 650C. During collision, the pressure and temperature rose to >10 kb and about 750C. The Ladakh garnets started to grow at >10 kb, 750C with subsequent decrease in metamorphic pressure to 8.5 kb. After the collision, the massif and the Kohistan-Ladakh rocks equilibrated at similar conditions of usd O thermometry results are consistent with the phase equilibrium studies of the massif and the Kohistan-Ladakh arc. Temperatures were calculated from O fractionations among quartz, garnet, feldspar, biotite, muscovite and amphibole. Among the analyzed samples, the whole rock usd\rm\delta\spO\sb{SMOW}usd isotopic values range from 7 to 15.3usd\perthoususd, quartz 7.4 to 16.4usd\perthoususd, feldspar 7 to 16.1usd\perthoususd, garnet 5.3 to 13.7usd\perthoususd, biotite 3.9 to 12.6usd\perthoususd, muscovite 6.7 to 12.7usd\perthoususd, and hornblendic amphibole from 4.4 to 7.2usd\perthoususd. Calculation of the O composition of fluids that were in equilibrium with different minerals in the temperature range of 500-700C reveals that there is one pre-metamorphic and one post-metamorphic fluid activity affecting the isotopic composition of the rocks of the massif. The pre-metamorphic fluids probably originated from an igneous parent, depleting the rocks in 2usd\perthoususd, especially along the major faults. The post-metamorphic fluids probably originated from prograde metamorphic reactions and were heavy enough to enrich the feldspars up to 18usd\perthoususd.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Earth sciences
موضوع مستند نشده
Geochemistry
موضوع مستند نشده
Geology
موضوع مستند نشده
Mineralogy
موضوع مستند نشده
oxygen-18
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )
مستند نام اشخاص تاييد نشده
J. W. Shervais
مستند نام اشخاص تاييد نشده
M. U. K. Khattak
دسترسی و محل الکترونیکی
نام الکترونيکي
مطالعه متن کتاب وضعیت انتشار
فرمت انتشار
p
اطلاعات رکورد کتابشناسی
نوع ماده
[Thesis]
کد کاربرگه
276903
اطلاعات دسترسی رکورد
سطح دسترسي
a
تكميل شده
Y
