The slab failure in Central Java (Indonesia): New insight into its tectonic setting and origin

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
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Abstract

The geochemical and tectonic characteristics of volcanic formations in Central Java, specifically the Sumbing-Slamet volcanics, were investigated to understand the processes associated with slab failure in the region. Through comprehensive geochemical analysis and comparison with other volcanic formations, insights into the magmatic evolution and tectonic settings of the Sumbing-Slamet volcanics were gained. The findings support the hypothesis of slab tearing beneath Central Java, as evidenced by distinct geochemical signatures and magmatic interactions observed in the Sumbing-Slamet volcanics. Geochemical data reveal medium to high potassium content (K2O = 0.77–2.32%), low Nb/Y (<0.6561), low TiO2 relative to Al2O3 [TiO2 < (−1.1610 + 0.1935 × Al2O3)], Th/La >0.2, as well as a wide range of Nb/La and Nb/Zr (0.14–0.89 and 0.0304–0.0744, respectively), notable depletions in high-field strength elements (HFSE; such as Nb, Ti), low to high Ta-anomaly (δTa = 0.21–1.03), and whole-rock isotopes of 87Sr/86Sr (0.704458–0.705800) and 143Nd/144Nd (0.513059–0.512766) demonstrate that they were formed from active continental margin (ACM) tectonics involving subducted sediment input. These magmatic processes likely resulted from the mixing of lithospheric and asthenospheric mantle sources due to slab failure in the northern part of Central Java. The research contributes to strengthening the geophysical view regarding the existence of slab tearing in Central Java, understanding the dynamic geological processes occurring in subduction zones, and emphasizing the importance of interdisciplinary approaches in studying such phenomena.

中爪哇(印度尼西亚)的板块崩塌:对其构造背景和起源的新认识
对中爪哇火山岩层,特别是松宾-斯拉梅火山岩的地球化学和构造特征进行了研究,以了解该地区板块崩塌的相关过程。通过全面的地球化学分析以及与其他火山岩层的比较,研究人员深入了解了松宾-斯拉梅特火山岩的岩浆演化和构造环境。研究结果支持中爪哇地下板块撕裂的假说,在松宾-斯拉梅火山岩中观察到的独特地球化学特征和岩浆相互作用证明了这一点。地球化学数据揭示了中高的钾含量(K2O = 0.77-2.32%)、低 Nb/Y (<0.6561)、相对于 Al2O3 较低的 TiO2 [TiO2 < (-1.1610 + 0.1935 × Al2O3)]、Th/La >0.2,以及广泛的 Nb/La 和 Nb/Zr (分别为 0.14-0.89 和 0.0304-0.从低到高的Ta-异常(δTa = 0.21-1.03)以及87Sr/86Sr(0.704458-0.705800)和143Nd/144Nd(0.513059-0.512766)的全岩同位素来看,它们是由涉及俯冲沉积物输入的活动大陆边缘构造形成的。这些岩浆过程很可能是中爪哇北部板块断裂导致岩石圈和星体层地幔源混合的结果。这项研究有助于加强关于中爪哇存在板块撕裂的地球物理观点,了解俯冲带发生的动态地质过程,并强调跨学科方法在研究此类现象中的重要性。
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来源期刊
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
5.00%
发文量
20
审稿时长
103 days
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