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Tertiary magmatic belts in Java
Soeria-Atmadja R.a, Maury R.C.b, Bellon H.b, Pringgoprawiro H.a, Polve M., Priadi B.b
a Jurusan Teknik Geologi, Institut Teknologi Bandung, Indonesia
b Departement des Sciences de la Terre, Université de Bretagne Occidentale, France
c Institut de Physique du Globe, Departement des Sciences de la Terre, Université de Paris 6 et 7, France
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Evidence of the earliest magmatic event (Late Eocene-Early Miocene) has recently been discovered in East Java (Pacitan area) as exposures of pillow lava flows. Stratigraphically they represent the lowermost part of Besole Formation (Oligocene-Early Miocene) which is made up mainly of volcanic turbidites. Major element chemistry of the lava flows indicates typical island arc tholieites with a significant Nb anomaly and relatively flat REE patterns. In Central Java the same magmatic event resulted in the emplacement of tholeitic intrusion at Karangsambung, Luk Ulo. The corresponding volcanic products of this event in West Java are represented by the Jampang Formation (Oligocene-Early Miocene) which is limited to the southern part of West Java. The chemistry of Neogene volcanic rocks which have been collected from the Jatiluhur-Sanggabuana area in West Java show that they are calc-alkali basalts and andesites. Some of them are marked by higher K2O contents leading to the potassic calc-alkali and shoshonitic rock series; similar phenomena are found in the Neogene volcanics of Karangkobar in Central Java. In East Java (Pacitan-Trenggalek area) outcrops of calc-alkali basalt flows underlie the limestones of the Punung Formation (Middle-late Miocene); the latter is also cut by dykes and volcanic necks of more differentiated rocks. From the pattern of distribution of the Tertiary volcanics, two parallel east-west trending magmatic belts may be recognized; the belt along the southern part of Java is related to Paleogene subduction, whereas the other to the north is related to Neogene subduction. The Quaternary volcanic cones in general are distributed within the Neogene magmatic belt. © 1993.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Indonesia, Java[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/0743-9547(94)90062-0[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]