STUDY OF THE BEHAVIOR OF RARE EARTH ELEMENTS IN WAYANG WINDU GEOTHERMAL FIELD, WEST JAVA
The Wayang Windu geothermal field has several locations of rock alteration in the form of clay minerals spread around geothermal manifestation areas. The existence of this clay mineral has the potential to become a place for trapping Rare Earth Elements (REEs) in nature which occurs due to the ab...
Saved in:
| Main Author: | |
|---|---|
| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/77212 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Wayang Windu geothermal field has several locations of rock alteration in
the form of clay minerals spread around geothermal manifestation areas. The
existence of this clay mineral has the potential to become a place for trapping
Rare Earth Elements (REEs) in nature which occurs due to the absorption of the
REEs' ions between layers of clay minerals (ion-adsorption). One method of
observing REEs in geothermal fields is by taking samples from altered outcrops
on the ground surface. Determination of REE anomaly patterns is carried out by
measuring the content of trace elements that are common in geothermal areas
using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analysis. The
study was conducted using 41 sample points for clay REEs and 137 soil pH
measurements obtained from previous studies. In addition, there are 45 soil pH
measurement points taken based on indications of clay mineral potential that have
been obtained based on literature studies and processing of satellite imagery.
There are three satellite images used in this study, namely DEMNAS, Landsat 8
OLI, and ALOS PALSAR images. Then the results of processing the distribution of
REEs based on the pattern of enrichment and correlation of each element are
compared with the direction of the straightness of the structure obtained from
grouping the dominant direction of the surface straightness as a parameter that
correlates with the distribution of REEs. The results of grouping the sample points
based on the pattern of chondrite enrichment (Boynton, 1985) showed three main
enrichment groups of REEs, namely: the positive Eu anomaly group, the positive
Ce-Eu-Er anomaly, and the positive Ce-Er anomaly. In general, the distribution
of grades for each REE value has a straight line with NE-SW, where based on the
type of alteration mineral, it is dominated by advanced propylitic-argillic types. |
|---|