Bambang Priadi

• Doctor of Philosophy
• Lecturer at Bandung Institute of Technology

The development of studies on the classification of magmatic alkalinity. ( Middlemost, 1975 --> Turner et al., 1996 --> Godang et al., 2021; Godang et al., 2025)

The Adang Volcanic and Talaya Volcanic complex located in the Mamuju area are ancient volcanic complexes of the Neogene period. These two complexes consist of pyroclastic, volcaniclastic, and basic-intermediate lava containing the main modal minerals of leucite and clinopyroxene, making these rocks unique and rarely found in Indonesia. This study a...

Chemical weathering of rocks has been investigated since 1960, and lithogeochemistry has commonly been used since 1980 to determine the protoliths of heavily weathered igneous rocks. However, it is still quite difficult to uniquely identify the laterite originating from a potassic basaltic rock, which formed in the anorogenic/within-plate environme...

Located in Natar, South Lampung, there is paleozoic carbonate included in the Gunungkasih Formation members. It is supposed to explain the geological history's uniqueness to the paleoenvironment during the Paleozoic age in western Indonesia. We concern with identifying the lithofacies by chemostratigraphy. We used several representative core data i...

The enrichment of Rare Earth Elements (REEs) in regolith depends on greatly number of chemical weathering degree, the ability of the ion-adsorption on clay, precipitation of REEs, minimum uptake by plants, and minor REE leaching out by lessivage. The degree of chemical weathering depends on the decaying of four base weathering elements (Mg, Ca, Na,...

Abstract - The discrimination of magmatic alkalinity is a classic study that has never stopped for the past ninety years. Various methodologies have been developed since Shand’s classification using the method of alumina saturation to approach silica saturation and the methodology without involving alumina and silica such as K2O vs. Na2O and others...

The enrichment of Rare Earth Elements (REEs) in regolith depends on greatly number of chemical weathering degree, the ability of the ion-adsorption on clay, precipitation of REEs, minimum uptake by plants, and minor REE leaching out by lessivage. The degree of chemical weathering depends on the decaying of four base weathering elements (Mg, Ca, Na,...

The violent eruption of Krakatoa Volcano located in the Sunda Strait, Indonesia, in 1883 represents one of the deadliest eruptions in human civilization. Although lots of data have been reported, the trajectory of the subducted slab and the upper mantle structure beneath this volcano are still rather poorly known. We combined geochemical data, majo...

Violent eruption of Krakatoa Volcano located in the Sunda Strait, Indonesia has attracted earth scientists around the world as one of the killer eruptions in human civilization. Although much data have been reported, the interior of subducted slab and mantle structure beneath this volcano is poorly known. We combined geochemical data, major, trace...

The Adang Volcanics represent a series of (ultra) potassic to sodic lavas and tuffaceous rocks of predominantly trachytic composition, which forms the part of a sequence of Late Cenozoic high-K volcanic and associated intrusive rocks occurring extensively throughout Western Sulawesi. The tectonic setting and origin of these high-K rocks have been t...

Geologi Pulau Bangka disusun oleh variasi granit sebagai Granitoid Klabat yang tersebar di berbagai lokasi. Unsur jejak dapat diaplikasikan dalam diskriminasi magmatisme dalam pembentukan granitoid tersebut. Tujuan penelitian ini adalah mengetahui karakteristik granitoid yang tersebar di Pulau Bangka berdasarkan geokimia unsur jejak untuk diaplikas...

Volcanism around Northern-Arm Sulawesi occurred during Tertiary to Quaternary time. Tectonic activity takes important role in the development of Sulawesi island. Tinombo Formation Wobudu Breccias and Dolokapa Formation are cropped out in the Bintauna-Labuanaki areas, in the northern coast of Northern-Arm of Sulawesi. Eleven samples have been analyz...

We employed a tomographic inversion technique to determine P- and S-wave velocity structures beneath the Mt. Guntur complex in West Java, where an active volcano is present. Our tomographic images clearly show low values of Vp and Vs located in the same position beneath the Mt. Guntur complex. The decrease in the P-wave velocity is faster than that...

A joint Indonesia - U.S. Expedition to Sangihe Talaud waters (INDEX SATAL) in the north area of the North Sulawesi Province has been conducted by the Okeanos Explorer of NOAA and the Baruna Jaya IV of Indonesia during July - August, 2010. The joint expedition was the first of its kind that covered multi aspects of science which aimed at discoveries...

Thermal waters at Ciarinem and Cilayu, Pameungpeuk, West Java, Indonesia have different characteristics: Ciarinem water is a steam heated sulfate type and occurs as hot springs, whereas Cilayu water discharges as hot pools and is a chloride water type. Their chemical compositions indicate that the thermal waters are outflows of a volcanic–magmatic...

A study at several geothermal systems in West Java, Indonesia shows that thermal waters could naturally contain up to 2.6 ppm As and 6.5 ppb Hg, and the surface hydrothermal alteration could contribute up to 50 ppm As and 800 ppb Hg. The higher the chloride content, the higher the contents of As and Hg of thermal waters. The amounts of As and Hg in...

Through an ambitious but relatively low-cost program of marine fieldwork, laboratory investigations and technology-transfer and training activities, three Indonesia-Australia-led marine expeditions were undertaken aboard KR Baruna Jaya VIII between 2001 and 2003. These IASSHA (Indonesia-Australia Survey for Submarine Hydrothermal Activity) cruises...

The Neogene Western Sulawesi Arc, from the south going northwards, can be divided into three magmatic provinces of K alkaline–shoshonitic (AK-SH), high-K calc-alkaline (KCA), and low-K–normal calc-alkaline (TH-CA) affinity, referred to, respectively, as South, Central and North Sulawesi. The origin of this magmatism in terms of subduction and colli...

Acidic potassic calc-alkaline (CAK) magmas have been emplaced in the central part of the western arm of Sulawesi from 6.5 to 0.6 Ma, mostly as peraluminous dacites, rhyolites and granites. They overlay or crosscut a high-grade metamorphic basement including lower crustal garnet peridotites and granulites, the latter showing evidences for incipient...

The NE–SW Tertiary magmatic belt of central Kalimantan is related to two separate periods of subduction; during the Eocene–Oligocene and Late Oligocene–Miocene. The younger magmatic belt is superimposed upon the earlier belt. This magmatic belt is characterized chiefly by Late Oligocene–Miocene volcanic products, among which limited exposures of th...

Plio–Quaternary lavas and granites have been collected from Ambon, Seram, Kelang, Haruku, Saparua, Ambelau and Banda Api islands, Eastern Indonesia. They include low-K calc-alkaline basalts, andesites, dacites and rhyolites and high-K calc-alkaline andesites, dacites, rhyolites and granites. All these rocks present the usual chemical characteristic...

Tertiary and Quaternary magmatic rocks from West Sulawesi record the complex history of part of the Sundaland margin where subduction and collision have been and are still active. The present study, based on petrographic data, major- and trace-element chemistry and 40K40Ar dating aims to document the age and chemical characteristics of the magmati...

Eocene BABB basalts intruded by tholeiitic and calk-alkalic island arc magmatic rocks are reported from the north arm of Sulawesi (Indonesia). Age and geochemical similarities between these basalts and those drilled in the Celebes Sea indicate this North Sulawesi volcanic arc was built on the same oceanic crust. The 25° late Neogene clockwise rotat...

40K-40Ar ages (27 new ones) and geochemical data (major and trace elements) allow the recognition of four main magmatic events in Central Sulawesi (South of Palu and in the Toraja area). The oldes magmatic activity took place during Late Eocene and Oligocene, and led to the emplacement of island arc tholeiites and calc-alkaline magmas as intrusions...

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 in...

Extensive paleomagnetic sampling (34 sites) was carried out in Cenozoic formations of the North Arm of Sulawesi (between 120 and 124°E).Consistent results obtained between 120 and 122°E suggest the existence of a unique post-Miocene clockwise rotation of about 20–25° of the western part of the North Arm. This rotation probably occurred during the n...

Two distinct Tertiary magmatic events are shown to have occurred in central Java. Both are characterized by an increase of potassium with time (transition from low-K to medium-K and sometimes K-rich calc-alkaline series). The first magmatic episode took place during the Eocene to Early Miocene (40-19 Ma). The corresponding W-E trending volcanic axi...