Oxygen isotopic composition of fruit carbonate in Lithospermeae and its potential for paleoclimate research in the Mediterranean

Oxygen isotopic composition of fruit carbonate in Lithospermeae and its potential for paleoclimate research in the Mediterranean
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紫草科水果碳酸盐的氧同位素组成及其在地中海古气候研究中的潜力

DOI:
10.1016/j.gloplacha.2009.11.015
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发表时间:
2010
影响因子:
3.9
通讯作者:
Hilger
Hilger
中科院分区:
地球科学1区
文献类型:
--
作者:
Pustovoytov;Hilger

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石灰质果皮的部落Lithospermeae(fam. Boraginaceae)是地中海地区古植物大残体组合的常见组成部分。研究了果木生物碳酸盐氧同位素组成与气候条件的关系。对欧亚大陆7个遗址(柏林、基尔兴泰林斯福特、哥廷根、雅典、安卡拉、第比利斯和阿拉木图)的现代石皮类果实和东地中海3个考古遗址(特洛伊、库姆泰佩和希尔贝特-泽拉孔)的果实化石中生物碳酸盐的δ 18 O和δ 13 C值进行了测量。此外,三个14 C测量古水果碳酸盐从Hirbet ez-Zeraqon。δ 18 O和δ 13 C值分别在−9至5‰ PDB和−35至−7‰ PDB之间。现代水果中,生物碳酸盐δ 18 O与当地夏季降水量成反比,与夏季气温成正比。在果实化石中,Troy和Kumtepe碳酸盐的δ 18 O值显著低于Hirbet ez-Zeraqon(约1000)。分别为−5和2‰ PDB)。稳定同位素值和14 C年龄在文化层的Hirbet ez-Zeraqon的垂直分布表明,水果生物碳酸盐可以坚持在沉积物中没有明显的成岩蚀变。这些研究结果表明,生物碳酸盐的Lithospermeae水果可以作为古气候代理至少在地中海是有用的。
Calcareous pericarps of the tribe Lithospermeae (fam. Boraginaceae) are a common component of archaeobotanical macroremain assemblages in the Mediterranean region. In this study, the relationship between oxygen isotopic composition of fruit biogenic carbonate and climatic conditions was examined. δ18O and δ13C values of biogenic carbonate were measured in modern Lithospermeae fruits from seven Eurasian sites (Berlin, Kirchentellinsfurt, Göttingen, Athens, Ankara, Tbilisi, and Almaty) and in fossil fruits from three archaeological sites in the eastern Mediterranean (Troy, Kumtepe, and Hirbet ez-Zeraqon). Additionally, three14C measurements were performed on ancient fruit carbonate from Hirbet ez-Zeraqon. The δ18O and δ13C values varied from −9 to 5‰ PDB and between −35 and −7‰ PDB respectively. In modern fruits, δ18O of biogenic carbonate was correlated to local summer precipitation amounts (inversely proportional) and summer air temperatures (proportional). In fossil fruits, the δ18O values of carbonate from Troy and Kumtepe were significantly lower than that from Hirbet ez-Zeraqon (ca. −5 vs. 2‰ PDB respectively). The vertical distribution of stable isotopic values and14C dates in cultural layers of Hirbet ez-Zeraqon indicate that fruit biogenic carbonate can persist in sediment without appreciable diagenetic alteration. These findings suggest that biogenic carbonate of Lithospermeae fruits can be useful as a paleoclimate proxy at least in the Mediterranean.
朴树 (Celtis) 内果皮中生物碳酸盐的 14C 测年潜力
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