Palaeoclimate and palaeoenvironmental responses in the western Mediterranean over the last 140 ka: evidence from Mallorca, Spain
Palaeoclimate and palaeoenvironmental responses in the western Mediterranean over the last 140 ka: evidence from Mallorca, Spain
复制标题
过去 140 ka 西地中海的古气候和古环境反应：来自西班牙马略卡岛的证据
DOI：
10.1144/gsjgs.156.2.0435
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发表时间：
1999
影响因子：
2.7
通讯作者：
C. Watson
中科院分区：
文献类型：
--
作者：
J. Rose;Xing;C. Watson
根据西班牙马略卡岛东北部沿海沿着的沉积物和土壤序列，研究了西地中海盆地过去140 ka的气候变化。从沉积物和土壤结构、海洋和陆地软体动物区系、粒度分布、矿物磁性、沉积物和土壤化学、SEM和氧同位素值重建古气候和古环境。年代测定是通过光释光和氨基酸地质年代学沿着海洋软体动物群组合。记录OIS 6至1的所有氧同位素阶段和子阶段。年平均气温（m.a.t.）梭19.2°C为末次间冰期的气候最佳值，与c. 17.3°C，与高海平面，广泛的林地和稳定的土壤有关，尽管在这个阶段检测到宽的温度范围，低至c。10.3°C。通过OIS 5d至5a m.a.t.在8.2°C至17.9°C之间波动。低海平面，开放的植被，有效的河流活动和风沙和灰尘沉积的特点5d和5b，而相对较高的海平面和土壤发展稳定的景观占主导地位的OIS 5c和5a。OIS 4由m.a.t.表示。梭4.9°C，风成沙和黄土沉积，河流活动有限，土壤发育薄弱。黄土沉积持续到OIS 3，但此时m.a.t.是C。13°C和更高的湿度和植被生长。在LGM（OIS 2）m.a.t.是C。8.1°C和有效的河流，斜坡和风成作用，沿着与有限的植被覆盖，是负责最广泛的景观变化。主要的变化率发生在气候恶化期间，当时高水平的地貌能量强加于正在经历植被破坏的景观。
Climatic change in the western Mediterranean basin over the last 140 ka has been investigated from sediment and soil sequences along the coast of the northeastern part of Mallorca, Spain. Palaeoclimate and palaeoenvironments are reconstructed from sediment and soil structures, marine and terrestrial molluscan fauna, grain size distributions, mineral magnetics, sediment and soil chemistry, SEM and oxygen isotope values. Dating is by OSL and amino acid geochronometry along with marine molluscan faunal assemblages. All Oxygen Isotope stages and substages from OIS 6 to 1 are recorded. Mean annual temperatures (m.a.t.) of c. 19.2°C for the climatic optimum of the Last Interglacial compare with c. 17.3°C for the present, and are associated with high sea level, extensive woodland and stable soils, although wide temperature ranges are detected during this stage with values as low as c. 10.3°C. Through OIS 5d to 5a m.a.t. fluctuated from 8.2°C to 17.9°C. Low sea level, open vegetation, effective river activity and aeolian sand and dust deposition characterize 5d and 5b while relatively high sea-level and soil development on stable landscapes dominate OIS 5c and 5a. OIS 4 is represented by m.a.t. of c. 4.9°C with aeolian sand and loess deposition, limited river activity and weak soil development. Loess deposition persisted into OIS 3, but at this time the m.a.t. was c. 13°C and with higher humidity and vegetation growth. During the LGM (OIS 2) m.a.t. was c. 8.1°C and effective river, slope and aeolian processes, along with associated with limited vegetation cover, were responsible for the most extensive changes in the landscape. Major rates of change occur during periods of climatic deterioration when the high levels of geomorphic energy were imposed on a landscape undergoing a breakdown of vegetation cover.