Download or read book Origin and Tectonic Setting of Ophiolitic Ultramafic and Related Rocks in the Atlin Area British Columbia NTS 104N written by Christopher Henry Ash (H.) and published by Province of British Columbia, Ministry of Energy, Mines and Petroleum Resources. This book was released on 1994 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of a detailed investigation of the tectonic setting and origin of ultramafic and related rocks in the Atlin area. The Atlin area was selected for detailed study because of its excellent road access, the large number of listwanite-related lode gold occurrences, and the extensive exploration database available for many of these occurrences. Following detailed mapping of the ultramafic rocks underlying the town of Atlin and Monarch Mountain in 1989, the area was revisited in 1990 and the map area extended to establish tectonic relationships between the ultramafic and surrounding lithologies. The phase chemistry of the harzburgite and associated dunite were investigated and are used to establish the origin of the units. Whole-rock major, trace, and rare-earth element chemistry is presented for basaltic rocks spatially associated with the ultramafics. These data are used to place constraints on the paleotectonic eruptive setting of the unit and to model the character of the mantle source from which the rocks were derived.

Download or read book Geology and Mineral Resources of the Tagish Lake Area NTS 104M 804M 8 9 10E 15 and 104N 12W Northwestern British Columbia written by Mitchell George Mihalynuk and published by University of British Columbia Press. This book was released on 1999 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2010 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geological Fieldwork written by and published by . This book was released on 2003 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 1340 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Economic Geology written by and published by . This book was released on 2000 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ophiolitic and Related M langes written by Gerald Joseph Home McCall and published by . This book was released on 1983 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ophiolites of the Canadian Appalachians and Soviet Urals written by J. Malpas and published by Department of Geology Memorial University of Newfoundland. This book was released on 1979 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Betts Cove Ophiolite and Its Cover Rocks Newfoundland written by Jean H. Bédard and published by Natural Resources Canada. This book was released on 2000 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Betts Cove area of the Baie Verte Peninsula, northern Newfoundland, is of interest for its mineral exploration history and for its ophiolitic complex formed through sea floor spreading. This study attempts to resolve some of the unresolved problems related to the area's stratigraphy, the magmatic affinity of its plutonic section, and the geologic controls on ore deposition. The report presents a revised stratigraphy for the area; a petrologic description of the rock units of the Betts Cove ophiolite, Snooks Arm Group, adjoining ophiolitic rocks, and post-Ordovician rocks; a history of structural deformation in the area; information on mineral chemistry, geochemistry, and petrogenesis; and tectonic models illustrating the evolution of the ophiolite and its cover rocks. The final section describes mineral deposits & occurrences in the area, including historic volcanogenic copper/sulphide mines, the currently producing Nugget Pond mine, and various gold occurrences.

Download or read book Tectonic setting origin and obduction history of the Spontang ophiolite Ladakh Himalaya NW India written by R.I. CORFIELD and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Petrology of the Coast Range Ophiolite Near San Simeon California written by Paul Michael Mehring and published by . This book was released on 2009 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fragment of the middle Jurassic (165.55 ± 0.12 Ma) Coast Range ophiolite (CRO) is present near San Simeon, San Luis Obispo County, California. Rocks from different levels of the ophiolite sequence are exposed along 5.5 km of fresh, wave-cut coastline between Ragged Point and Piedras Blancas Point. The ophiolite crops out with ultramafics in the north and volcanics and chert in the south. For this study 238 samples were examined petrographically. Twenty samples were selected for electron probe microanalysis (EPMA) in order to determine mineral composition of plagioclase, clinopyroxene, orthopyroxene, olivine, and chromian spinel. Nine samples from the diabase sill complex were selected for whole-rock geochemistry. Ragged Point (~0.5 km length of exposure) has abundant ultramafic cumulate rocks that include serpentinized dunite. The ultramafics are intruded by meter-thick mafic sills. Breaker Point (~1.5 km of exposure) has abundant ultramafic and mafic cumulate rocks that include serpentinized dunite, wehrlite, olivine clinopyroxenite, clinopyroxenite, websterite, gabbro(norite), and clinopyroxene troctolite. As at Ragged Point, the cumulate ultramafics are intruded by meter-thick mafic sills. Point Sierra Nevada (~2.0 km of exposure) has hornblende-bearing (up to 15% estimated modal abundance) gabbro(norite) and massive hornblende gabbro in fault contact with a sheeted diabase sill complex. The gabbroic rocks are cross-cut by swarms of 3-25 centimeter hornblende-rich (up to 40% modal abundance in ~200 m length of exposure) diabase intrusions. Point Piedras Blancas (~1.8 km of exposure) has volcanics including pillow and breccia flows faulted against thin-bedded chert. Meter-wide slices of residual harzburgite are present within fault zones at both Ragged Point and Point Sierra Nevada. A tall (>700 meters) magma chamber must have been present to explain the measured thickness of ultramafic and mafic cumulates. The field observations indicate that cumulate ultramafics (dunite, wehrlite, olivine clinopyroxenite, clinopyroxenite, and websterite) are followed up-sequence by cumulate gabbroic rocks and then massive hornblende gabbro. This order indicates a crystallization sequence of olivine ± chromian spinel; then olivine + clinopyroxene ± orthopyroxene ± hornblende ± chromian spinel; then plagioclase + clinopyroxene ± olivine ± orthopyroxene ± hornblende; followed by plagioclase + hornblende ± clinopyroxene ± Fe-Ti oxide. Compositional ranges of minerals are consistent with formation from a single differentiating mafic magma: plagioclase (An98 to An30); clinopyroxene (Mg#: 91 to 79); orthopyroxene (Mg#: 85 to 75); olivine (Fo91 to Fo71); and chromian spinel (Cr#: 48 to 82). The new data are similar to those reported for other CRO fragments. The appearance of low-TiO2 clinopyroxene before highly calcic plagioclase in the crystallization sequence and the relative abundance of orthopyroxene in cumulate ultramafic and mafic rocks indicate magma with a high MgO/SiO2 ratio and suggest that the differentiating mafic magma was extracted from asthenosphere that experienced moderate degrees of partial melting (15 to 30%). A moderate degree of partial melting is greater than expected for those at open-ocean-spreading ridges (~15%), and is explained as due to the addition of subducted H2O. Selected samples from the sheeted diabase sill complex are geochemically similar to CRO volcanics at Del Puerto, Llanada, and Point Sal. Their compositional range for major-, trace-, and rare-earth-elements suggest that the San Simeon ophiolite formed from a differentiating parental magma, which had a component of subducted material. The addition of LIL-enriched hydrous fluids (and possibly subducted sediment) from the down-going plate fluxed the asthenosphere resulting in moderate degrees of partial melting. The San Simeon CRO is interpreted to be an on-land slab of ocean crust formed at a slow-spreading center (few cm/yr) above a west-directed subduction zone. A rifting-arc or back-arc environment, similar to the Mariana Trough (Deep Sea Drilling Project Leg 60), is proposed for the San Simeon ophiolite.

Download or read book Ophiolites written by Robert Griffin Coleman and published by Springer. This book was released on 1977 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Betts Cove Ophiolite and Related Rocks of Snooks Arm Group Newfoundland written by Hansa Datt Upadhyay and published by 1973.. This book was released on 1973 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology of the Cuesta Ridge Ophiolite Remnant Near San Luis Obispo California written by Cameron Allen Snow and published by . This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Skarns in British Columbia written by Gerald E. Ray and published by . This book was released on 1997 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Skarns in British Columbia have historically been important sources of iron, tungsten, copper, and gold. This publication begins with an introduction on skarn terminology and the problems of skarn identification. It then reviews a genetic model of skarn formation and presents descriptive profiles of eight types of skarn deposits; describes the database of at least 735 skarn occurrences in the province, and the number and distribution of skarns in British Columbia according to their associations, class, age, and distribution; and notes the ages of British Columbia skarns and the total production of various metals extracted from British Columbia skarns. Subsequent sections provide information on assays and metal ratios of mineralized skarns, skarn mineralogy, skarn mineral chemistry, chemistry of skarn-related intrusions, and the mapping and evaluation of skarns. The appendix contains a listing of 735 skarn occurrences in British Columbia, giving deposit name, MINFILE number, latitude/longitude, elements and minerals present, and associated rocks and their ages.

Download or read book Jade in Canada written by S. F. Leaming and published by Energy, Mines and Resources Canada ; Hull, Qué. : available from Print. and Pub. Supply and Services Canada. This book was released on 1978 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tectonics Metallogeny and Discovery written by Maurice Colpron and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This summary report commences with a brief metallogenic overview of the northern Pacific Rim, with particular attention paid to the world-class Mesozoic and Cenozoic ore deposits that define the region's premier metallogenic provinces. This is followed by a summary of the relative attractiveness of the region's various mining jurisdictions, as recorded by recent exploration activity.