tailieunhanh - Ebook Tiếng Anh chuyên ngành Địa chất: Phần 2 - Trần Bỉnh Chư

 Tiếp nối phần 1 của cuốn sách "Tiếng Anh chuyên ngành Địa chất", phần 2 trình bày nội dung phần 3 - Mineral deposits, description of deposits. Đây là một tài liệu hữu ích được biên soạn dành cho các bạn sinh viên chuyên ngành Đại chất và Đại chất mỏ. nội dung chi tiết.   | PART THREE DESCRIPTION OF DEPOSITS CHAPTER VII . Pb-Zn-Ag ORE DEPOSIT OF THE PINNACLES I. INTRODUCTION The Pinnacles mine at lat. E long. 32 l3 s is 10 miles south - west of Broken Hill and with a production and ore expectancy of about 200 000 tons is the largest known sulphide deposit of the district outside of the Broken Hill lode. Since the last comprehensive paper in the Pinnacles King 1953 further detailed mapping of the Pinnacles Mine and the general area has led to a reinterpretation of the geology. The results of this additional study coupled with those from further work in the Broken Hill area stress the strong resemblance between these two deposits. The similarity of the lode systems and the general environment of the ore deposits argue a common genesis for both orebodies. In addition a closer definition of the stratigraphy of the Pinnacles ore environment has established that horrizons such as the aplitic gneiss are not unique in the succession as formerly thought but are repeated at several stratigraphic levels. This observation allows a simpler interpretation of the structure as it eliminates the need for postulating tight isoclinal folding. IL STRATIGRAPHIC SUCCESSION The generalized stratigraphic succession of the Pinnacles area comprises sillimanite biotite and garnet gneisses separating the six numbered formations. Underlying this succession in the Stirling Vale erea north of the Pinacles is a similar sequence of rocks of identical lithological character. This lower sequence which does not include quartz magnetite is represented in part in the north-east corner of Fig. In the regional interpretation of the stratigraphy of the Broken Hill mine area. Repetition of the principal marker horizons in the sedimentary environment is common and occurs in a cyclic manner as shown by Formation 5 the depositional cycle containing the lode horizons of the Pinnacles mine. The thickness of individual beds can be extremely variable and sedimentary lensing is

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