Download e-book for iPad: Kimberlites and Their Xenoliths by Professor J. Barry Dawson (auth.)

By Professor J. Barry Dawson (auth.)

ISBN-10: 3642677428

ISBN-13: 9783642677427

ISBN-10: 3642677444

ISBN-13: 9783642677441

In nowadays of data explosion and high-cost publishing, it really is possibly purely average for an writer to persuade the analyzing public that it's getting anything worthy interpreting. finally, extreme learn into the higher mantle during the last twenty years has already ended in a couple of volumes on kim­ berlites and their xenoliths. So why another one? First, during this e-book i've got targeting kimberlite as anyone rock-type and a sampler of the higher mantle, within the desire of complementing such monographs as Deep seated inclusions in kimberlites and the matter of the composition of the higher mantle by means of N. V. Sobolev and Geologie du Diamant by means of M. G. Bardet, that have centred extra on particular points of kimberlite and higher mantle geology; hence i have never tried to explain diamond prospecting and mining and, even though i've got tried to offer a few of the updated perspectives on xenolith petrology, the confines of house haven't approved me to discover the complexities of the higher mantle as deeply as has Sobolev. moment, the literature is immense and i've attempted to tug jointly for the reader the wide variety of perspectives and infor­ mation awarded either within the contemporary geological literature and in fresh multi-author volumes comparable to the lawsuits Vol­ umes of the 2 overseas meetings on Kimberlite held at Capetown in 1973 and Santa Fe in 1977.

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Additional resources for Kimberlites and Their Xenoliths

Example text

Janse (personal communication) believes that the Pamali breccias are not kimberlite, and certainly their tectonic setting in a geosynclinal area and their intrusion during an orogenic cycle are not typical for kimberlites. 2 Solomon Islands Intrusions of alnoite and ankaratrite, the former containing picroilmenite, diopside and pyrope, occur on the island of Malaita (Allen and Deans 1965). One alnoite breccia contains spinel and garnet peridotite xenoliths and a pyroxene/ilmenite intergrowth similar to those found in kimberlites.

The kimberlites are intruded into areas that have undergone epeirogenic fiexturing prior to their intrusion, and may be associated with local swell or dome structures. They are intruded up fundamental fractures that transact the trends of the deepest known basement terrains. 2. Kimberlites are also found in the circum-cratonic fold-belts but there is no evidence to suggest that they were intruded during the orogenic cycle. 3. On the cratons kimberlites occur as the only manifestations of very limited magmatic activity.

In the emplacement of kimberlite diatremes by fluidization, the role ofvolatiles is very important. Whereas exsolution of high-pressure gases from the ascending kimberlite has been reconized for some time (Dawson 1962), Clement (1975) has elaborated upon this by proposing a pre-eruption stage when carbonate-rich liquid forms a separate immiscible highly volatile zone at the top of the ascending kimberlite; this is a source of highly concentrated explosive fluid. Whilst much of the carbonate is probably of magmatic origin (although later modified by contact with high-level water), the hydrogen and oxygen isotope ratios of diatreme-facies serpentines strongly suggest that much of the "hydrothermal" water in diatreme serpentines and ground-mass micas is high-level groundwater, rather than of deep, mantle origin (Sheppard and Dawson 1975); a high-level input for this water also explains the extensive serpentinization of olivine in diatreme-facies as opposed to hypabyssal-facies kimberlites, and the relatively low water content in bulk-rock analyses of many hypabyssal-facies kimberlites.

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Kimberlites and Their Xenoliths by Professor J. Barry Dawson (auth.)


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