Relationship among paleosol types, depositional settings, and paleoclimates in Tetori group (Lower Cretaceous, central Japan)

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2022-04-11 DOI:10.1111/iar.12445
Kensuke Kuroshima, Masato Fujita, Yoshihiro Kakizaki, Fumito Shiraishi
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Abstract

One of the key areas and periods for dinosaur evolution is considered to be Early Cretaceous East Asia, of which paleoclimate, that affected dinosaur diversity, needs to be accurately estimated. This study reconstructed paleoenvironmental information from two paleosol sections of the Lower Cretaceous Tetori Group in Hokuriku province, Japan. Elemental and isotopic compositions indicate that the two sections (Sections K5 and T1) formed under similar mean annual temperature (MAT) and mean annual precipitation (MAP) but exhibit significantly different paleosol colors (red in the Section K5, and gray in the Section T1) and mineralogy of carbonate nodules (dolomite–siderite in the Section K5, and dolomite–calcite in the Section T1). In addition, the oxygen isotopic ratio of carbonate minerals in the Section K5 was significantly low. The differences in sedimentary features and isotopic composition were considered to reflect the differences of seasonal climatic factors (e.g., monsoon) and local settings (e.g., drainage condition) despite the two sections exhibiting similar MAT and MAP. The results of this study suggest that the northeastern margin of East Asia, where the Tetori Group was deposited, had temperate and humid climate with monsoonal contrast in humidity during Aptian to Albian.

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日本中部下白垩统鸟取群古土壤类型、沉积环境与古气候的关系
早白垩世东亚被认为是恐龙进化的关键区域和时期之一,需要对影响恐龙多样性的古气候进行准确估计。本研究重建了日本北陆省下白垩统四鸟群两个古土壤剖面的古环境信息。元素和同位素组成表明,两个剖面(K5和T1)在相似的年平均温度(MAT)和年平均降水(MAP)条件下形成,但古土壤颜色(K5剖面为红色,T1剖面为灰色)和碳酸盐结核(K5剖面为白云石-菱铁矿,T1剖面为白云石-方解石)的矿物学特征明显不同。此外,K5剖面碳酸盐矿物氧同位素比值明显偏低。尽管两个剖面具有相似的MAT和MAP,但沉积特征和同位素组成的差异反映了季节气候因素(如季风)和局部环境(如排水条件)的差异。本研究结果表明,东亚东北缘鸟鸟群沉积的地区在阿普天和阿尔比安时期具有温带湿润气候,湿度具有季风性对比。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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