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Latest Orogeny Stories

2012-03-13 09:08:43

Highlights include several studies based in the U.S. Sierra Nevada, including a description of "magma fingers" and the formation of granite in the high Sierra crest near Yosemite National Park. Other studies investigate knickzones in the South Fork of the Eel River, California; the Rodgers Creek-Maacama fault system in the northern California Coast Ranges and its relation to the San Andreas fault; and the frequency and severity of destructive debris flows in the Pacific Northwest....

2012-01-24 06:00:00

NEW YORK AND MONTREAL, Jan. 24, 2012 /PRNewswire/ - Canwealth Minerals Corporation and partner ICBS Ltd., (OTCPK: ICBT),)   is pleased to announce its upcoming assay sample program scheduled for early spring 2012, on its Highland Gold property. A complete geophysics and geochemistry tests will be performed to determine the length and width of the mineralized zone. The assay sample program will be based on a 100m grid. Drilling will follow immediately after the assay results...

2011-10-19 07:30:00

VANCOUVER, Oct. 19, 2011 /PRNewswire/ - Focus Ventures Ltd. (TSXV: FCV) is pleased to report that it has staked 6,700 hectares in two separate areas within the Southern Peru Slate Belt, an emerging gold district that extends south into Bolivia. The Katenwill claims cover 5,500 hectares located in the Province of Carabaya, Department of Puno, and are contiguous with claims that cover Lupaka Gold Corp's (TSX:LPK) Crucero discovery. Lupaka has defined an Indicated Resource of 814,638...

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2010-12-18 08:51:49

50 million years ago, mountains began popping up in southern British Columbia. Over the next 22 million years, a wave of mountain building swept (geologically speaking) down western North America as far south as Mexico and as far east as Nebraska, according to Stanford geochemists. Their findings help put to rest the idea that the mountains mostly developed from a vast, Tibet-like plateau that rose up across most of the western U.S. roughly simultaneously and then subsequently collapsed and...

2010-12-03 15:54:50

Our research at the State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, has shown, based on a refined division and correlation of the graptolite-bearing strata in southern Jiangxi, China, that the Kwangsian Orogeny commenced in the early Katian Age of the Late Ordovician. Because of its significant research value, this study is published in Issue 11 of Science China Earth Sciences. An angular unconformity separating the Lower-Middle...

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2010-08-26 07:57:40

New seismic technique detects boundary between old and new lithosphere The North American continent is not one thick, rigid slab, but a layer cake of ancient, 3 billion-year-old rock on top of much newer material probably less than 1 billion years old, according to a new study by seismologists at the University of California, Berkeley. The finding, which is reported in the Aug. 26 issue of Nature, explains inconsistencies arising from new seismic techniques being used to explore the interior...

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2009-09-11 15:22:07

An international team of researchers has created the most complete seismic image of the Earth's crust and upper mantle beneath the rugged Himalaya Mountains, in the process discovering some unusual geologic features that may explain how the region has evolved. Their findings, published this week in the journal Science, help explain the formation of the world's largest mountain range, which is still growing. The researchers discovered that as the Indian and Eurasian tectonic plates collide,...

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2008-11-17 11:50:35

Intense glacial erosion has not only carved the surface of the highest coastal mountain range on earth, the spectacular St. Elias range in Alaska, but has elicited a structural response from deep within the mountain. This interpretation of structural response is based on real-world data now being reported, which supports decades of model simulations of mountain formation and evolution regarding the impact of climate on the distribution of deformation associated with plate tectonics. A team of...

2008-09-19 03:00:23

By Tanner, Geoff Abstract: None of the major roles assigned to the Highland Boundary Fault, such as a transcurrent fault with an orogen- parallel, sinistral displacement of several hundred kilometres, or terrane boundary, are confirmed. The Highland Boundary Fault can be traced NE-SW across Scotland for >240 km and defines the northern margin of the Midland Valley. Except for small outliers of Late Palaeozoic rocks on the NW side, it separates the Highland Border Ophiolite and Dalradian...

2008-09-19 03:00:23

By Schofield, D I Evans, J A; Millar, I L; Wilby, P R; Aspden, J A A new U-Pb date of 615.2 +- 13 (2sigma) Ma for the Twt Hill Granite, North Wales, contrasts with an Rb-Sr isochron age of 491 +- 12 (2sigma) Ma from the same body. The latter age is thought to result from isotope resetting during regional low-grade metamorphism or fault reactivation. The Rb-Sr age also coincides with the onset of latest Cambrian to Early Tremadoc regression and is taken to reflect tectonic uplift prior to...