John Drew Ridge's Annotated Bibliographies of Mineral Deposits in Africa, Asia PDF

Asia

By John Drew Ridge

ISBN-10: 0080204597

ISBN-13: 9780080204598

Show description

Read or Download Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia PDF

Similar asia books

New PDF release: The Fall of The Philippines

Для сайта:Мир книгАРМИЯ СОЕДИНЕННЫХ ШТАТОВ ВО ВТОРОЙ МИРОВОЙ ВОЙНЕ. Война в Тихом океане. ПАДЕНИЕ ФИЛИППИН. This quantity, one of many sequence usa military IN international struggle II, is the fourth to be released within the subseries THE struggle within the PACIFIC. all of the volumes may be heavily similar^ and the sequence will current a entire account of the actions of the IVtilitary institution in the course of- global warfare II.

Alistair Moffat (auth.), Rafael E. Banchs, Fabrizio's Information Retrieval Technology: 9th Asia Information PDF

This booklet constitutes the refereed court cases of the ninth info Retrieval Societies convention, AIRS 2013, held in Singapore, in December 2013. The 27 complete papers and 18 poster displays integrated during this quantity have been rigorously reviewed and chosen from 109 submissions. they're geared up within the following topical sections: IR conception, modeling and question processing; clustering, type and detection; normal language processing for IR; social networks, user-centered stories and personalization and functions.

Allen Noren's Storm. A Motorcycle Journey of Love, Endurance, and PDF

All started as a grand event, hurricane tells the tale of a visit that speedy turned a tumultuous attempt of patience. whilst the Baltic States of the previous Soviet Union unfolded, Allen and his female friend Suzanne have been interested in the chance of touring jointly once more. taking off on a bike, the 2 professional tourists rode via Germany, Denmark, and Sweden to the Arctic Circle, then directly to Finland, Russia, Estonia, Latvia, Lithuania, and Poland.

Additional info for Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia

Sample text

The lower Bulawayan consists of a basal conglomerate that contains pebbles and boulders of Sebakwian rocks that, in part, are composed of chromite and of the altered portions of the ultramafics. The basal conglomerate was followed by over 7000 feet of arkose, graywacke, and banded ironstone, this sedimentary RHODESIA 43 sequence was interrupted by the extrusion of basalts and the intrusion of many dolerite and some gabbro-pyroxenite sills. The Bulawayan sedimentation had ceased by the time of the intrusion of late Bulawayan granite batholiths and the uplift that accompanied them.

Since gold-quartz veins in the Hartley area are known to cut through the Younger (Biri) granite as well as the older Rhodesdale, it appears probable that the ore fluids came from the same general magma source as the molten mate­ rial from which the Biri granite crystallized and were of much the same age. Between the intrusion of the Rhodesdale and the Biri granites, the following events intervened: (1) the beds of the Bulawayan and Shamvaian systems were laid down, (2) sedimentation of the Bulawayan beds was interrupted by the ex­ trusion of several thousand feet of mafic lavas, (3) deep-seated pressures continued to dome the granite north and southeast of the mine area and synclinally folded the sediments, (4) final folding and settlement was associated with prolonged vertical shearing within the syncline, near zones of weakness between sediments and lavas, (5) torsional movements at much the same time created slight horizontal folds, and, within a weak arch in the sediments, a dolerite stock was intruded, (6) the intrusion of the dolerite greatly exag­ gerated and increased the size of the synclinal fold, (7) tangential stresses were set up relative to this stock and the Cam Spur and the Cam faults were produced, with the former along the line of weakness caused by the lens of north-south striking sediments, (8) as these movements continued, the faults and fractures were reopened and filled with carbonates, (9) the Biri granites then were intruded to the north of the present mine area, while the basement rocks were invaded by numerous related dikes and sills of potash-rich and soda-rich porphyries, (10) the Rhodesdale granite was intruded by minor peg­ matites and mineralized quartz veins were deposited in it, (11) at approxi­ mately the same time, the calcite-filled fractures in the basement (Bulawayan) rocks were invaded by hydrothermal fluids that deposited the metallic and nonmetallic minerals listed later, and (12) vertical movements continued after the gold and its associated minerals had been deposited, and the veins were reopened and were filled with carbonates.

No recent Rhodesian statistics are available. Interpretation of the stratigraphic succession in the Mangula district has undergone several changes in recent years, with Stagman (1959) and Jacobsen (1964) having the sequence in one order but with Jacobsen (1963, written after the 1964 paper cited above) reversing the sequence of the rocks of the immedi­ ate mine area. The oldest rocks in the general area are those of the Bulawayan and Shamvaian systems that make up the middle and upper portions of the Archean basement over so much of Rhodesia.

Download PDF sample

Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia by John Drew Ridge


by Steven
4.0

Rated 4.55 of 5 – based on 18 votes