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Bernal-Casasola Darío Bustamante-Álvarez Macarena Díaz José J. López-Sáez José Antonio Gutiérrez-Rodríguez Mario Vargas Girón José Manuel Portillo-Sotelo José Luis Pascual Sánchez María Ángeles Moujoud Tarik 《African Archaeological Review》2021,38(2):175-209
African Archaeological Review - Recent archaeological excavations (2016–2019) in the city of Tamuda (northern Morocco) yielded evidence of commercial milling and bread-making facilities dated... 相似文献
998.
Goldstein S. T. Crowther A. Henry E. R. Janzen A. Katongo M. Brown S. Farr J. Le Moyne C. Picin A. Richter K. K. Boivin N. 《African Archaeological Review》2021,38(4):625-655
African Archaeological Review - Novel trajectories of food production, urbanism, and inter-regional trade fueled the emergence of numerous complex Iron Age polities in central and southern Africa.... 相似文献
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African Archaeological Review - The study of raw materials is an essential step in lithic analysis, regardless of the age, provenance, and technology of the assemblages. As in many other contexts... 相似文献
1000.
Fluid inclusion and isotopic constraints on the origin of ore‐forming fluid of the Jinman–Liancheng vein Cu deposit in the Lanping Basin,western Yunnan,China
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Extensive quartz–carbonate–Cu sulfide veins occur in clastic rocks and are spatially related to Paleocene granites in the western border of the Lanping Basin, western Yunnan, China. Abundant aqueous‐carbonic fluid inclusions occur in these veins but their origin is debated. In the Jinman–Liancheng deposit, individual primary inclusion groups contain either exclusively liquid‐rich inclusions (Gl), or coexisting liquid‐rich and vapor‐rich inclusions (Glv). Microthermometry and estimate of CO2 content indicate that type Gl inclusions either have homogenization temperatures (Th) 238–263°C and contain c. 3.9–5.5 mole % CO2, or have Th 178–222°C and contain c. 1.6–3.2 mole % CO2. Type Glv inclusions are thought to represent samples of fluid unmixing that occurred at 183–218°C. At that time, the liquid phase in the unmixing fluid may contain c. 2.0–3.3 mole % CO2. As such, the correlation of CO2 content with Th for type Gl inclusions is thought to be caused by fluid unmixing with decreasing temperature and subsequent CO2 escape. δ18O and δD values of the parent water mainly fall in the field below that of primary magmatic water, indicative of fluid derivation from degassed (in open system) magmatic water, with no contributions from basinal or meteoric water. Initial Sr isotopic compositions of hydrothermal carbonates suggest that the fluid was magmatic, probably derived from the Paleogene granites. δ13CPDB values (?4‰ to ?7‰) of the hydrothermal carbonates and δ34SV‐CDT values of sulfides (mainly ?11‰ to +5‰) indicate that the carbon and sulfur can be derived from (degassed) magma and/or nonmagmatic sources. The CO2‐rich and magmatic‐water‐derived fluid at Jinman–Liancheng differs from the CO2‐poor and basinally derived fluid in sediment‐hosted stratiform Cu (SSC) deposits, which suggests that there are no genetic linkages between the vein Cu and SSC deposits in the Lanping Basin. 相似文献