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Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr...
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This location is part of the Arizona Mineral Industry Location System (AzMILS), an inventory of mineral occurences, prospects and mine locations in Arizona. SantaCruz91B is located in T23S R14E Sec 28 SE in the Nogales - 15 Min quad. This collection consists of various reports, maps, records and related materials acquired by the Arizona Department of Mines and Mineral Resources regarding mining properties in Arizona. Information was obtained by various means, including the property owners, exploration companies, consultants, verbal interviews, field visits, newspapers and publications. Some sections may be redacted for copyright. Please see the access statement.
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Mudflow near Laguna del Negro Francisco. Atacama Province, Chile. No date.
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Criss-crossing game trails, Atacama Desert, near Vallenar. Chile. No date.
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Silty nitrate-bearing salar crust. Shallow nitrate workings in the southern part of Salar de Pampa Blanca. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 28-A. 1974.
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View of karst topography taken from boat on trip down the Li River south of Guilin. Fog partially obscures karst structures. China, October 28, 1983. (Similar to Photo No. mwh020cp)
Categories: Image; Tags: China, International, photo print
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Rugged perennial rock-salt crust showing delicate clinker-like texture, southeastern part of Salar de Atacama. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 22. 1974.
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View of karst topography taken from boat on trip down the Li River south of Guilin. Roof on boat visible at left. China. October 28. 1983.
Categories: Image; Tags: China, International, photo print
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Silty nitrate-bearing salar crust. Shallow nitrate workings in the southern part of Salar de Pampa Blanca. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 28-A. 1974.
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China. Karst topography, viewed from a boat on the Li River south of Guilin. October 28, 1983.
Categories: Image; Tags: China, International, photo print
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Remnant of salt cone, a salt cup, on the rugged perennial rock-salt curst in the northwestern part of Salar de Pedernales. Atacama Province, Chile. Circa 1962.
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Greenland. Solifluction lobes on the side of a kame 1 mile east of Beach Camp, northeast of Thule Air Force Base. August 1953.
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Rock glacier which descends from Cerro del Plomo, 20,300 feet in the Andes. Central Chile. No date.
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View of karst topography, at left, taken from boat on trip down the Li River south of Guilin. River in foreground; houses and terraced slope on far shore. A foggy day. China. October 28, 1983.
Categories: Image; Tags: China, International, photo print
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Sand dune encroachment near village of Agelat. Some of the wasteland recently reclaimed by dune fixation (dissing). The dissing is finished on this dune near Gharabulli, and the area is ready for tree planting. Libya. Circa 1958. Published in U.S. Geological Survey Professional Paper 660, Figure 5-B. 1970.
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Aerial view from south of Tehran, of snow-capped Elburz Mountains. Mount Demavend, 18,000-foot altitude, peak at left. (Part of plane visible at lower right.) Iran. 1965.
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Aerial view of Kavir Desert. (Part of plane visible at right.) Iran. 1965.
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Looking down Yukon from White River. Canada. Yukon Territory. August 24, 1903.
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Looking up Yukon from White River. Canada. Yukon Territory. August 24, 1903.


map background search result map search result map ADMMR mining collection file: Dura Group The chemistry of eolian quartz dust and the origin of chert ADMMR mining collection file: Dura Group The chemistry of eolian quartz dust and the origin of chert