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Late Cretaceous–Paleogene palaeoclimate reconstruction of the Gippsland Basin, SE Australia
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 2.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.palaeo.2020.109885
Lian Jiang , Wenjing Ding , Simon C. George

Abstract The Cretaceous–Paleogene palaeovegetation and palaeoclimate in the Gippsland Basin was reconstructed using vascular plant-derived biomarkers, and are consistent with other proxy evidence for palaeoclimate (e.g. spore-pollen assemblages and plankton foraminifera oxygen isotopes). Variation in the higher plant-derived aliphatic and aromatic sesquiterpenoids, diterpenoids and triterpenoids resulted from vegetation succession, and is different in the T. lilliei, F. longus, L. balmei, M. diversus, P. asperopolus and N. asperus palynological biozones. Analyses of the oleanane index, the higher plant parameter, the higher plant index, the higher plant fingerprint, and various aliphatic and aromatic angiosperm/gymnosperm indices indicate the late Cretaceous–Paleogene (ca. 80–40 Ma) palaeoclimate in the Gippsland Basin was initially warm (Campanian T. lilliei Biozone), and then changed in this way: → cool (Maastrichtian upper F. longus Biozone), → warm (Paleocene L. balmei Biozone), → hot (early Eocene M. diversus and P. asperopolus Biozones), → warm and then cool (middle Eocene N. asperus Biozone). This changing climate trend is mostly consistent with global climate changes. In comparison to the analogous Taranaki Basin (western New Zealand), the Gippsland Basin is inferred to have had a less gymnosperm-dominated rainforest and a warmer climate in the late Cretaceous. During the Paleogene the palaeoclimate was similar in the two basins, as deduced from the angiosperm/gymnosperm indices of the sedimentary rocks.

中文翻译:

澳大利亚东南部吉普斯兰盆地晚白垩世-古近纪古气候重建

摘要 Gippsland 盆地的白垩纪-古近纪古植被和古气候是使用维管植物衍生的生物标志物重建的,并且与古气候的其他替代证据(例如孢子-花粉组合和浮游生物有孔虫氧同位素)一致。高等植物来源的脂肪族和芳香族倍半萜类化合物、二萜类化合物和三萜类化合物的变异是由植被演替引起的,在 T. lilliei、F. longus、L. balmei、M. diversus、P. asperopolus 和 N. asperus 孢粉生物区中有所不同. 齐墩果指数、较高的植物参数、较高的植物指数、较高的植物指纹以及各种脂肪族和芳香族被子植物/裸子植物指数的分析表明晚白垩世-古近纪(约 80-40 Ma) Gippsland 盆地的古气候最初是温暖的(Campanian T. lilliei Biozone),然后以这种方式变化:→凉爽(Maastrichtian upper F. longus Biozone),→温暖(Paleocene L. balmei Biozone),→热(始新世早期 M. diversus 和 P. asperopolus Biozones),→ 温暖然后凉爽(中始新世 N. asperus Biozone)。这种不断变化的气候趋势与全球气候变化大体一致。与类似的塔拉纳基盆地(新西兰西部)相比,据推测,吉普斯兰盆地在白垩纪晚期拥有较少以裸子植物为主的热带雨林和温暖的气候。根据沉积岩的被子植物/裸子植物指数推断,在古近纪期间,两个盆地的古气候相似。→ 温暖(古新世 L. balmei Biozone),→ 热(早始新世 M. diversus 和 P. asperopolus Biozones),→ 温暖然后凉爽(中始新世 N. asperus Biozone)。这种不断变化的气候趋势与全球气候变化大体一致。与类似的塔拉纳基盆地(新西兰西部)相比,据推测,吉普斯兰盆地在白垩纪晚期拥有较少以裸子植物为主的热带雨林和温暖的气候。根据沉积岩的被子植物/裸子植物指数推断,在古近纪期间,两个盆地的古气候相似。→ 温暖(古新世 L. balmei Biozone),→ 热(早始新世 M. diversus 和 P. asperopolus Biozones),→ 温暖然后凉爽(中始新世 N. asperus Biozone)。这种不断变化的气候趋势与全球气候变化大体一致。与类似的塔拉纳基盆地(新西兰西部)相比,据推测,吉普斯兰盆地在白垩纪晚期拥有较少以裸子植物为主的热带雨林和温暖的气候。根据沉积岩的被子植物/裸子植物指数推断,在古近纪期间,两个盆地的古气候相似。与类似的塔拉纳基盆地(新西兰西部)相比,据推测,吉普斯兰盆地在白垩纪晚期拥有较少以裸子植物为主的热带雨林和温暖的气候。根据沉积岩的被子植物/裸子植物指数推断,在古近纪期间,两个盆地的古气候相似。与类似的塔拉纳基盆地(新西兰西部)相比,据推测,吉普斯兰盆地在白垩纪晚期拥有较少以裸子植物为主的热带雨林和温暖的气候。根据沉积岩的被子植物/裸子植物指数推断,在古近纪期间,两个盆地的古气候相似。
更新日期:2020-10-01
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