Výsledky vyhledávání - "David B. Wenner"

Using 18O/16O data to examine the mixing of water masses in floodplain wetlands

Autor: David B. Wenner, Wesley S. Hardegree, Kenneth W. McLeod, John F. Dowd

Publikováno v: Wetlands Ecology and Management. 3

Oxygen isotopic data were used to assess how far waters from the Savannah River, a major river in the Southeastern United States, backed up and inundated the wetlands along a small Coastal Plain tributary during a flood. This approach worked because

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff1b88b1ae56df1f73ece027f5fd5f23
https://doi.org/10.1007/bf00180024

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Oxygen isotopic study of the nature and provenance of large quartz and chert clasts in gold-bearing conglomerates of South Africa and Stable isotope compositions of quartz pebbles and their fluid inclusions as tracers of sediment provenance: Implications for gold-and uranium-bearing quartz pebble conglomerates: Comment and Replies

Autor: Richard W. Hutchinson, David B. Wenner, Stephen E. Kesler, Jackson M. Barton, James R. O'Neil, D. K. Hallbauer, Torsten Vennemann, R. P. Viljoen

Publikováno v: Geology. 21:858

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ef215d3b4a9d9e51dfd7d9191ab17052
https://doi.org/10.1130/0091-7613(1993)021<0858:oisotn>2.3.co

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Oxygen isotopic study of the nature and provenance of large quartz and chert clasts in gold-bearing conglomerates of South Africa

Autor: David B. Wenner, J. M. Barton, D. K. Hallbauer

Publikováno v: Geology. 20:1123

Large quartzite and chert clasts in the Archean gold-bearing reefs of South Africa have distinctive δ18O values that fall within a restricted range, 8.8‰ to 13.1‰. These values are thought to reflect the sources of the clasts and are not the res

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2219b07f911a0ba47899bf8e82633e5b
https://doi.org/10.1130/0091-7613(1992)020<1123:oisotn>2.3.co

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Mining for the lowest grade ore: Traditional iron production in northern Malawi

Autor: David B. Wenner, Nikolaas J. Der Van Merwe

Publikováno v: Geoarchaeology. 2:199-216

Two contrasting, well preserved Iron Age mines are described from the Nyika Plateau of Malawi. At the first, Ncherenje, about 1600 m3 of material was mined over a linear distance of about 3 km from numerous shallow pits, several large excavations, an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::58eec48a75ec87ed6afa84021e084264
https://doi.org/10.1002/gea.3340020302

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D/H and O18/O16 studies of serpentinization of ultramaflc rocks

Autor: David B. Wenner, Hugh P. Taylor

Publikováno v: Geochimica et Cosmochimica Acta. 38:1255-1286

Oxygen and hydrogen isotope analyses have been obtained on serpentine and related metasomatic talc and ‘blackwall’ minerals from the following ultramaflc-rock types: 1. (1) alpine associations in unmetamorphosed or low-grade metamorphic terranes;

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5a8192f82fe30a11d7f5485f87c47925
https://doi.org/10.1016/0016-7037(74)90120-3

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Uranium and thorium geochemistry in the elberton batholith of the Southern Appalachians, USA

Autor: David B. Wenner, James D. Spaulding

Publikováno v: Mineralogical Magazine. 46:227-231

U and Th data have been obtained by ~,-ray spectrometry on samples from thirty quarry sites in the Elberton batholith, a large (500 km 2) late orogenic (320 Ma) mesozonal biotite granite in the Southern Piedmont, USA. The granite is enriched in the T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b0d052e3f0c2674a76a1b7bd37cb9ac8
https://doi.org/10.1180/minmag.1982.046.339.09

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Oxygen isotopic compositions of the late orogenic granites in the Southern Piedmont of the Appalachian Mountains, U.S.A., and their relationship to subcrustal structures and lithologies

Autor: David B. Wenner

Publikováno v: Earth and Planetary Science Letters. 54:186-199

Data were acquired from 143 whole rock samples from 20 late orogenic, post-metamorphic, Hercynian-age granitic plutons from the Piedmont of the southern Appalachians, principally in Georgia and South Carolina. These plutons exhibit a regional gradien

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f527286301d8a2fc07ee2859beda7ccb
https://doi.org/10.1016/0012-821x(81)90002-9

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Age, paleomagnetism, and tectonic significance of the Elberton Granite, northeast Georgia Piedmont

Autor: David B. Wenner, Douglas G. Mose, James A. Whitney, Craig Amerigian, Brooks B. Ellwood

Publikováno v: Journal of Geophysical Research: Solid Earth. 85:6521-6533

The Rb/Sr whole rock age of 350±11 m.y., the remanent magnetism (RM), and petrology of samples from 21 sites within the granitic Elberton pluton (NE Georgia) have been determined. Two partially conflicting estimates of tectonic rotation are develope

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::76c62e5ed13b3b69db33660e6e308e7e
https://doi.org/10.1029/jb085ib11p06521

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Temperatures of serpentinization of ultramafic rocks based on O18/O16 fractionation between coexisting serpentine and magnetite

Autor: Hugh P. Taylor, David B. Wenner

Publikováno v: Contributions to Mineralogy and Petrology. 32:165-185

Five lizardite-chrysotile type serpentinites from California, Guatemala and the Dominican Republic show oxygen isotope fractionations of 15.1 to 12.9 per mil between coexisting serpentine and magnetite (δO18 magnetite=−7.6 to −4.6 per mil relati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3ab3fb57cd3d00c5a7d72b0b29124650
https://doi.org/10.1007/bf00643332

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