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Chusni Ansori
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Sociological perspective on the elimination of Karanganyar Regency as an impact of the 1930s economic depression Teguh Hindarto; Chusni Ansori
SIMULACRA: JURNAL SOSIOLOGI Vol 3, No 1 (2020)
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/sml.v3i1.7201

Abstract

 The 1930s economic crisis in the United States had spread throughout the world and caused a number of social, economic, political and cultural impacts, including for the Dutch East Indies colonies. Karanganyar Regency, which was in the Bagelen Residency territory since 1901, had experienced the effects of the economic shock as well. Karanganyar was a district in the Kebumen Regency area. Before becoming a sub-district, Karanganyar was an independent regency and had its head of government from 1832 until 1936. Through literature studies, this paper intended to thoroughly analyze the existence of Karanganyar Regency in the colonial era, find out the background of its elimination, and the process of social change that occurred. To obtain the main variables that cause the elimination of Karanganyar Regency, the researcher utilized the historical comparative method. From the analysis, we concluded that the Economic Depression centred in the United States affected the Dutch East Indies colonies, particularly on the management of the government bureaucracy. This situation demanded the Dutch East Indies government to adapt to social change by removing a number of Regency, including Karanganyar Regency.
Petrologi dan Geokimia Batuan Dasit Komplek Mélange Luk Ulo Isyqi Isyqi; Chusni Ansori; Defry Hastria; Fitriany Amalia Wardhani; Mohammad Al'Afif; Edi Hidayat; Eko Puswanto
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 29, No 1 (2019)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1749.204 KB) | DOI: 10.14203/risetgeotam2019.v29.968

Abstract

Kompleks Mélange Luk Ulo (KMLU) disusun berbagai macam bongkah batuan yang tercampur secara tektonik dalam masa dasar lempung hitam, salah satu bongkah batuannya adalah dasit. Penelitian ini bertujuan untuk mengetahui karakteristik petrologi dan geokimia batuan dasit KMLU untuk mengetahui lingkungan tektonik dan sejarah pembentukannya. Metode yang digunakan antara lain adalah analisis petrografi, analisis unsur utama menggunakan fusion inductively coupled plasma, analisis unsur jejak dan unsur tanah jarang menggunakan inductively coupled plasma mass spectrometry, serta analisis umur absolut menggunakan metode K-Ar. Dasit KMLU memiliki tesktur porfiritik, disusun fenokris kuarsa, plagioklas, dan feldspar alkali tertanam dalam masa dasar mikrokristalin kuarsa dan mikrokristalin biotit. Kandungan unsur SiO2 yang tinggi (66,56-71,64%) dan K2O yang rendah (0,41-1,27%) menunjukkan batuan memiliki afinitas magma toleit. Unsur low ionic potential pada Dasit KMLU mengalami pengkayaan relatif terhadap MORB sebanyak 2-8 kali sedangkan unsur-unsur high ionic potential lebih rendah dibandingkan MORB, mengindikasikan batuan terbentuk pada tatanan tektonik busur kepulauan. Pengkayaan unsur tanah jarang ringan sebesar 3 - 9 kali dibandingkan kondrit yang disertai pola pengurangan (depletion) berangsur-angsur dari unsur La hingga Eu juga mengindikasikan tatanan tektonik busur kepulauan. Pengukuran umur absolut menunjukkan kisaran 65-48 juta tahun lalu, menunjukkan bahwa Dasit KMLU terbentuk dari magmatisme busur kepulauan pada masa Kapur akhir–Eosen Awal.The Luk Ulo Mélange Complex (KMLU) is an assemblage of various blocks of rock that are mixed tectonically and blanked by scaly clay matrix, in which one of blocks is dacite. This research aims to determine petrological and geochemical characteristics of dacite in order to define its tectonic environments and formation history. The methods used in this research were petrography analysis, geochemical analysis including major elements using fusion inductively coupled plasma (fus ICP), trace and rare earth elements using inductively coupled plasma mass spectrometry (ICP-MS) and K-Ar dating method.  The dacite has a porphyritic texture composed of quartz, plagioclase, and alkali fledspar phenocrysts in microcrystaline biotite and quartz matrix. The high SiO2 content (66.56 - 71.64%) and low K2O content (0.41 - 1.27%) indicating tholeiitic magma affinity source. The low ionic potential elements such as Sr, K, Rb, Ba dan Th in this rock have been enriched 2 - 8 times compared to MORB, whereas the high ionic potential elements of Ta, Nb, Ce, P, Zr, Hf, Sm, Ti, Y dan Yb are lower compared MORB suggest an island arc character. Enrichment of light rare earth elements  (La, Ce, Pr, Nd, Pm, Sm and Eu) is 3 - 9 times compared to chondrit accompanied by gradual depletion pattern of La to Eu elements also indicating an island arc environment.  K-Ar dating analysis shows a range of 65 - 48 Mya or during the Late Cretaceous – Early Eocene. It is concluded that the dacite of the Luk Ulo Complex was formed in an island arc tectonic setting during the Late Cretaceous – Early Eocene.
Co-Authors Defry Hastria Edi Hidayat Eko Puswanto Fitriany Amalia Wardhani Isyqi Isyqi Mohammad Al'Afif Teguh Hindarto