Geophysical interpretation of the geology of the Stanthorpe region using aeromagnetic, gravity and radiometric data

Kumwenda, Joel; Lackie, Mark

doi:10.1080/08123985.2019.1659102

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Only anomalies 1 (Tolukuma) and 5 (Mt. Kodu) display radiometric attributes that are often attributed to porphyry intrusions, especially granitic suites [7]; they display enhanced counts in all three radiometric channels. The combined effect of three radiometric channels (K, Th, and U) in the ternary imaging process produces a lighter signature, as displayed by anomalies 1 and 5, compared to areas with low counts in the three radiometric elements…”

Section: Discussionmentioning

confidence: 99%

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Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience

et al. 2021

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Airborne magnetic and radiometric datasets have, over the past few years, become powerful tools in the identification of porphyry systems which may host economic porphyry copper–gold–molybdenum ore bodies. Magnetisation contrasts with the unaltered host rocks, coupled with the elevated radiometric signature, compared to the host rock, makes identification of large-scale porphyry copper systems possible. Integrating these two different datasets with stream sediment data and other geochemical exploration methods results in a higher degree of confidence. Stream sediment data were analysed to see the distribution of copper and gold elements throughout the study area, located within the Eastern Papuan Peninsula of Papua New Guinea. Airborne geophysics data over the same area were also processed for magnetic and radiometric responses. The processing of the magnetic data revealed several magnetic anomalies related to concealed intrusive rock units, with associated radiometric signatures. The distribution of gold and copper anomalism was correlated with the geology and geophysical signatures. Results indicate varying degrees of correlation, with some areas showing a strong correlation between gold/copper occurrence and geophysical signatures, compared to other areas. Some factors that we believe impact the level of correlation may include tectonic history, volcanic cover, and weathering patterns. We recommend caution when applying multi-data exploration for porphyry copper systems.

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Section: Discussionmentioning

confidence: 99%

“…Their emplacement has long been associated with calc-alkaline intrusive rocks [4,5] and arc magmatism [1]. These rocks often display an elevated potassium signature [6], low Th, and low Th/K signatures [7].…”

Section: Introductionmentioning

confidence: 99%

Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience

et al. 2021

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“…Geophysical techniques form an integral part of most geological mapping works and have a wide application in reconnaissance surveys. In recent years, there has been an increasing use of geophysical methods, owing to their ability to map and delineate subtle physical variations in the geology most often missed during fieldwork (e.g., [1][2][3][4][5][6]).…”

Section: Introductionmentioning

confidence: 99%

A Multi-Method Approach to Geophysical Imaging of a Composite Pluton in North Portugal

Cruz,

Noronha,

Sant’Ovaia

2024

Minerals

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Potassium (K), thorium (Th), and uranium (U) are good markers of magmatic or alteration processes and the surface concentrations of these radioelements can be mapped at the regional or local scale through radiometric (gamma) surveys. In this study, a radiometric survey was performed in a post-orogenic pluton located in North Portugal, namely the Lamas de Olo Pluton, composed by three granitic facies. This pluton has already been intensively studied, including magnetic susceptibility, gravimetric, geochemical, and petrographic studies. The main objective of this work is to evaluate the radiometric data and combine them with other characteristics, such as magnetic susceptibility, and gravimetry, as well as to elucidate structures such as faults and fractures, outline geological boundaries, and identify alteration zones within various granites of the pluton. The radiometric approach reveals the spatial distribution of radioelements, offering a more distinct portrayal of the geology in the studied area. The radioactive heat production rate was calculated for the studied pluton, showing that the mean value is 4.09 µW m−3, surpassing the known mean values for granites. Our study highlights that radiometric measurements unveil compositional variations within granitic pluton and aid in identifying feeder zones. Furthermore, these measurements can be correlated with each type of granites, demonstrating associations with surface concentrations of K-Th-U. Our findings indicate a spatial alignment between the NE feeder root and a U-rich granite (Barragem granite), as evidenced by its elevated concentration of this radioelement. Conversely, the other root displays a notable relative concentration of Th, consistent with the Th-rich characteristics observed of the two other granites (Lamas de Olo and Alto dos Cabeços granites).

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Integrated Landsat multispectral imagery and airborne geophysical data for enhanced litho-structural mapping: A case study of Adamawa Massif, north-eastern Nigeria

Kamaunji

Gana

et al. 2022

Journal of African Earth Sciences

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Geophysical interpretation of the geology of the Stanthorpe region using aeromagnetic, gravity and radiometric data

Cited by 8 publications

References 18 publications

Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience

Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience

A Multi-Method Approach to Geophysical Imaging of a Composite Pluton in North Portugal

Integrated Landsat multispectral imagery and airborne geophysical data for enhanced litho-structural mapping: A case study of Adamawa Massif, north-eastern Nigeria

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