globalchange  > 过去全球变化的重建
DOI: 10.1016/j.gloplacha.2019.01.018
WOS记录号: WOS:000468717000013
论文题名:
Palynology and weathering proxies reveal climatic fluctuations during the Carnian Pluvial Episode (CPE) (Late Triassic) from marine successions in the Transdanubian Range (western Hungary)
作者: Baranyi, Viktoria1; Rostasi, Agnes2; Raucsik, Bela3; Kurschner, Wolfram Michael1
通讯作者: Baranyi, Viktoria
刊名: GLOBAL AND PLANETARY CHANGE
ISSN: 0921-8181
EISSN: 1872-6364
出版年: 2019
卷: 177, 页码:157-172
语种: 英语
WOS关键词: ISOTOPE EXCURSIONS ; DIVERSITY PATTERNS ; CLAY MINERALOGY ; SOUTHERN ALPS ; U-PB ; EVOLUTION ; GEOCHEMISTRY ; VEGETATION ; MOUNTAINS ; RECORD
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向: Physical Geography ; Geology
英文摘要:

In the early Late Triassic, the Carnian Pluvial Episode (CPE) is a phase with increased siliciclastic influx into the marine-carbonate dominated depositional setting of the Western Tethys assumingly caused by a shift to more humid climatic conditions and increased continental runoff. Here, vegetation changes inferred from the palynological assemblages and weathering proxies (alpha(Al)(1)) have been studied from the Transdanubian Range (TR), western Hungary to reveal climate variations and detect episodes with hygrophytic vegetation and enhanced continental hydrolysis. Palynostratigraphy has been applied to correlate the clastic pulses known from elsewhere in the Western Tethys. The quantitative palynological analysis indicates a shift towards hygrophytic elements in the Julian 2, and return to xerophytic associations in the Tuvalian. The increase in the hygrophytic vegetation elements is coincident with elevated kaolinite and partially with the increase of alpha-values indicating strong terrestrial runoff, enhanced continental hydrolysis and more humid climate in the lower part of the Veszprem Formation in the early Julian 2. The wetter conditions in the Julian 2 were periodically interrupted by shorter periods of drier climate manifested in the progradation of carbonate platforms and the deposition of carbonate series and breccias interbedded between the marl units. In the late Julian 2 the high amount of hygrophytes points to another humid episode, but the decrease of kaolinite in the clay mineral profile and the weathering indices might suggest stronger seasonality. Although, the multiple clastic pulses in the western Tethys were related primarily to more humid climate during the CPE, the comparison to clay mineralogy and weathering proxies suggest a more complicated scenario in the TR. The enhanced continental weathering related to a more humid climate is only suggested for the lower part of the Veszprem Formation in the early stages of the CPE in the Julian 2.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/139694
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作者单位: 1.Univ Oslo, Dept Geosci, POB 1047, N-0316 Oslo, Norway
2.Univ Pannonia, Dept Earth & Environm Sci, POB 158, H-8201 Veszprem, Hungary
3.Univ Szeged, Dept Mineral Geochm & Geochem, Egyet Utca 2-6, H-6722 Szeged, Hungary

Recommended Citation:
Baranyi, Viktoria,Rostasi, Agnes,Raucsik, Bela,et al. Palynology and weathering proxies reveal climatic fluctuations during the Carnian Pluvial Episode (CPE) (Late Triassic) from marine successions in the Transdanubian Range (western Hungary)[J]. GLOBAL AND PLANETARY CHANGE,2019-01-01,177:157-172
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