Primary Data

There are two main hypotheses. The first one is to answer the phase of intrusions in Ertsberg Intrusion Complex and the second is to identify the petrogenesis and tectonic setting of the Ertsberg Intrusion Complex. Geochemical data (XRF,ICP_MS) showed that there are two phases of intrusion and high-k calc-alkaline to shoshonitic magmas were enriched by sedimentary components in post-collision setting. In the research paper, sample identifying was done detail for each sample in the megascopic study to understand the crosscutting relationship of the rocks. Moreover, the important one is to collect and identify the fresh samples. For the geochemistry study, major elements were used to identify the processes of magma using Harker variation diagram, SiO2 vs K2O diagram, and trace elements were used to identify the petrogenesis of magma and tectonic setting using Ta/Yb versus Ce/Yb diagram, [Y+Nb] vs Rb geotectonic discrimination diagram, Ce/P2O5-3*Zr-50Nb ternary diagram, and spider diagram. Furthermore, combining the trace elements and REE elements were used to identify the genetic magma and possible tectonic setting using CI Chondrite-normalized REE diagram and LILE vs HFSE diagram.

本研究提出两项核心假说。其一旨在厘清埃茨贝格侵入杂岩体（Ertsberg Intrusion Complex）的侵入期次，其二则用于识别该杂岩体的岩石成因与构造背景。地球化学数据通过X射线荧光光谱法（XRF）与电感耦合等离子体质谱法（ICP-MS）测试获得，结果显示该杂岩体存在两期侵入作用，且碰撞后构造背景下的高钾钙碱性至钾玄质岩浆受到沉积组分的富集改造。在本研究中，研究人员针对每件样品开展了详细的宏观手标本鉴定工作，以厘清岩石间的穿切关系。尤为关键的一环是，研究团队采集并鉴定了新鲜的岩石样品。针对地球化学分析，本次研究借助哈克变异图、二氧化硅（SiO₂）-氧化钾（K₂O）图解，利用主量元素示踪岩浆演化过程；同时通过钽/镱（Ta/Yb）-铈/镱（Ce/Yb）图解、（Y+Nb）-铷（Rb）构造环境判别图解、Ce/P₂O₅-3Zr-50Nb三元判别图以及微量元素蛛网图，利用微量元素示踪岩浆成因与构造背景。此外，研究团队结合微量元素与稀土元素数据，通过CI球粒陨石标准化稀土元素配分图以及大离子亲石元素（Large Ion Lithophile Elements，LILE）-高场强元素（High Field Strength Elements，HFSE）图解，进一步限定了岩浆成因与可能的构造背景。