کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4696884 1637228 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shear-related gold mineralization in Northwest Ghana: The Julie deposit
ترجمه فارسی عنوان
کانی سازی طلا مرتبط با اتصال برشی در شمال غرب غنا: ذخایر جولی
کلمات کلیدی
طلای کوه زایی؛ غرب آفریقا؛ طلا در پیریت؛ غنا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی


• One of very few published work on gold deposits in NW Ghana
• Most likely the next operating mine in NW Ghana, to this day, the largest gold resource in the region.
• Relatively rare case of gold mineralization hosted in granitic rocks.
• A summary of the geological and mineralogical relationships at the Julie deposit, and of its exploration history.

The Julie deposit is currently the largest gold prospect in NW Ghana. It is hosted in sheared granitoids of TTG composition of the Paleoproterozoic Julie greenstone belt. The main mineralization consists of a corridor of gold-bearing quartz veins forming a network of a few tens of metres in thickness, trending E–W and dipping 30–60° N, contained within the main shear zone that affects these rocks. The core of this vein corridor is altered by sericite, quartz, ankerite, calcite, tourmaline and pyrite, and is surrounded by an outer halo consisting of albite, sericite, calcite, chlorite, pyrite and rutile. A second set of veins, conjugate to the first set, occurs in the area. These veins have alteration halos with a similar mineralogy as the main corridor, however, their extent, as well as the size of the mineralization, is less important. In the main corridor, gold forms micron-sized grains that occur in pyrite as inclusions, on its edges, and in fractures crosscutting it. Silver, tellurium, bismuth, copper and lead commonly accompany the gold. Pyrite occurs disseminated in the veins and in the surrounding rocks. Up to several ppm Au occurs in the structure of pyrite from the main mineralization.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ore Geology Reviews - Volume 78, October 2016, Pages 712–717
نویسندگان
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