Results 1 to 10 of about 58,213 (191)
Development of a quartz-based geothermometer for biogenic chert [PDF]
Scientific ReportsIn the accretionary complexes of areas where erosion is inactive, only biogenic chert is sometimes exposed and estimating diagenetic/metamorphic temperature in such areas is nearly impossible. We investigated the correlation of quartz crystallinity (CI),
Haruka Tanaka +3 more
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Current Biology, 2019 In 1912, William Mackie, a medical practitioner surveying the regional geology west of Aberdeen, Scotland, happened on some unusual rocks (Figure 1) near the village of Rhynie. Dark gray to nearly black and shot through with cylindrical structures a few millimeters in diameter, these rocks differed markedly from the shales and volcanic rocks of local ...
Strullu-Derrien, Christine +2 more
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Ilmu Pertanian (Agricultural Science), 2019 Understanding the nature of the soil is very important to know the potential and the proper management of the soil. This study aimed to determine the differences in morphological, physical, and chemical properties of the soils developing from gabbro ...
Ratna Taher, Makruf Nurudin, Eko Hanudin
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Shikarpur lithic assemblage: New questions regarding Rohri chert blade production
Journal of Lithic Studies, 2014 Recent excavations at Shikarpur, a fortified Harappan site situated near the Gulf of Kuchchh in Gujarat, Western India, brought to light a large collection of Rohri chert blades.
Charusmita Gadekar +2 more
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The color of transformation: Investigations into heat treatment of Natufian artifacts from Hayonim Terrace (Israel) [PDF]
, 2016 In the Natufian lithic component at Hayonim, both in the cave and the terrace, numerous artifacts of pink/red color may be recognized. Cherts with similar appearance are not present in the geological environment surrounding the site in Northern Israel ...
Delage, C, Sunseri, JU
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MINERALOGY, GEOCHEMISTRY AND ORIGIN OF CRETACEOUS CHERT FROM WADI AL-WALA, CENTRAL JORDAN
Iraqi Geological Journal, 2019 This research is aimed at detailed investigation of the origin chert rocks in Wadi Al-Wala area in central Jordan. The chert in the area is of Upper Cretaceous in age and belongs to the widely distributed chert on the western margin of the ...
Hassan Al-Fugha, Ahmad Al-Malabeh
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Journal of Materials Research and Technology, 2019 Cherty rocks, most abundant byproduct of mining industry, were used as adsorbent for the extraction of rare earth elements. Purified chert was characterized by various analytical methods (XRD, FX-ED, MEB, FTIR, laser granulometry).
Imen Bouchmila +3 more
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Journal of Lithic Studies, 2016 This work provides the keys to the mineralogical and geochemical characterization of black chert from the Vegamián Fm. This formation crops out throughout the whole of the Cantabrian Zone (of Palaeozoic age), one of the geological zones of the Cantabrian
Diego Herrero-Alonso +3 more
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Estudios Atacameños, 2004 Un alto porcentaje de los artefactos líticos que han sido recuperados en los sitios arqueológicos de la cuenca superior del Arroyo Tapalqué (Olavarría, Buenos Aires, Argentina) han sido confeccionados sobre ftanita o chert. Esta materia prima aparece en
María Paula Barros +1 more
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The rheological behaviour of fracture-filling cherts: example of Barite Valley dikes, Barberton Greenstone Belt, South Africa [PDF]
Solid Earth, 2015 In the Barberton Greenstone Belt, South Africa, a 100–250 m thick complex of carbonaceous chert dikes marks the transition from the Mendon Formation to the Mapepe Formation (3260 Ma). The sub-vertical- to vertical position of the fractures, the abundance
M. Ledevin +4 more
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