A small sample of human bone from Tomb BSII of the Chalcolithic cemetery of RemedelloSotto (Brescia, Northern Italy) was processed with the AMS technique. It gave a date of 4070 ± 70BP (Beta-35224; ETH-6196) corr...A small sample of human bone from Tomb BSII of the Chalcolithic cemetery of RemedelloSotto (Brescia, Northern Italy) was processed with the AMS technique. It gave a date of 4070 ± 70BP (Beta-35224; ETH-6196) corresponding to 2711 (2609) 2512 cal BC yrs (1 sigma). Una datazione radiometrica per la Tomba BSII del cimitero Calcolitico di RemedelloSotto (Brescia). Viene presentata la datazione radiometrica eseguita con il metodo dell’acceleratore sudi un frammento di osso di calcagno del piede destro dello scheletro di inumato della Tomba BSII delsepolcreto di Remedello Sotto. L’analisi ha fornito il risultato di 4070 ± 70 BP (Beta-35224; ETH-6196)corrispondente a 2711 (2609) 2512 cal BC (1 sigma).展开更多
Texture, mineralogy, geochemistry, and 14C ages of two deep-sea sediment cores （GM6 and GM7） recovered in the southwestern Gulf of Mexico were investigated to infer their provenance and depositional condition. The s...Texture, mineralogy, geochemistry, and 14C ages of two deep-sea sediment cores （GM6 and GM7） recovered in the southwestern Gulf of Mexico were investigated to infer their provenance and depositional condition. The sediments are enriched in fine-grained silt and clay and poor in sand content. Mineralogically, the sediments consist of quartz, calcite, smectite, and kaolinite. Based on the ]4C data, the age of the GM6 and GM7 sediment cores were calculated as 23,615 cal yrs. BP and 19,007 cal yrs. BP, respectively. The weathering indices such as chemical index of alteration （CIA）, chemical index of weathering （CIW）, and plagioclase index of alteration （PIA） in GM6 （56-69, 60-74, and 6]-73, respectively） and GM7 （54-69, 57-76, and 55-74, respectively） cores revealed a moderate-to-high intensity of weathering. The rare earth element （REE） patterns suggested that the sediments were derived mostly by the weathering of intermediate rocks, exposed along the coastal regions of the Gulf of Mexico. The trace elemental ratios like V/Cr （〈2）, Ni/Co （〈2）, and Cu/Zn （〈1）, authigenic uranium content （〈1）, and Ce anomaly （Ce/Ce＊ ≤1） suggested that the sediments were deposited under an oxic condition, which was also revealed by the benthic foraminiferal assemblages throughout the GM6 and GM7 sediment cores.展开更多
文摘A small sample of human bone from Tomb BSII of the Chalcolithic cemetery of RemedelloSotto (Brescia, Northern Italy) was processed with the AMS technique. It gave a date of 4070 ± 70BP (Beta-35224; ETH-6196) corresponding to 2711 (2609) 2512 cal BC yrs (1 sigma). Una datazione radiometrica per la Tomba BSII del cimitero Calcolitico di RemedelloSotto (Brescia). Viene presentata la datazione radiometrica eseguita con il metodo dell’acceleratore sudi un frammento di osso di calcagno del piede destro dello scheletro di inumato della Tomba BSII delsepolcreto di Remedello Sotto. L’analisi ha fornito il risultato di 4070 ± 70 BP (Beta-35224; ETH-6196)corrispondente a 2711 (2609) 2512 cal BC (1 sigma).
基金the partial financial assistance provided by the DGAPA-PAPIIT(No:IN106117)the Institute of Marine Sciences and Limnology(ICML),UNAM,Internal(No.616)projects+2 种基金DGAPA-PAPIIT,UNAM for the Bachelor degree scholarship(No:IN106117)the Posgrado en Ciencias del Mar y Limnologia(PCML)postgraduate program and to CONACyT for a doctoral fellowship(No.595593/308610)the support received by the Project"FACIES-PEMEX-PEP No:420401851"
文摘Texture, mineralogy, geochemistry, and 14C ages of two deep-sea sediment cores （GM6 and GM7） recovered in the southwestern Gulf of Mexico were investigated to infer their provenance and depositional condition. The sediments are enriched in fine-grained silt and clay and poor in sand content. Mineralogically, the sediments consist of quartz, calcite, smectite, and kaolinite. Based on the ]4C data, the age of the GM6 and GM7 sediment cores were calculated as 23,615 cal yrs. BP and 19,007 cal yrs. BP, respectively. The weathering indices such as chemical index of alteration （CIA）, chemical index of weathering （CIW）, and plagioclase index of alteration （PIA） in GM6 （56-69, 60-74, and 6]-73, respectively） and GM7 （54-69, 57-76, and 55-74, respectively） cores revealed a moderate-to-high intensity of weathering. The rare earth element （REE） patterns suggested that the sediments were derived mostly by the weathering of intermediate rocks, exposed along the coastal regions of the Gulf of Mexico. The trace elemental ratios like V/Cr （〈2）, Ni/Co （〈2）, and Cu/Zn （〈1）, authigenic uranium content （〈1）, and Ce anomaly （Ce/Ce＊ ≤1） suggested that the sediments were deposited under an oxic condition, which was also revealed by the benthic foraminiferal assemblages throughout the GM6 and GM7 sediment cores.
