The application of airborne geophysics to epithermal gold exploration in Eastern Misima Island, Papua New Guinea

1989 ◽  
Vol 20 (2) ◽  
pp. 85
Author(s):  
K. Logan
Keyword(s):  
Papua New Guinea ◽  
Mineral Exploration ◽  
New Guinea ◽  
Geological Mapping ◽  
Magnetic Data ◽  
Epithermal Gold ◽  
Magnetic Modelling ◽  
Port Moresby ◽  
Radiometric Data ◽  
Airborne Magnetic

Misima Island is situated 625 km east southeast of Port Moresby in Papua New Guinea. A detailed airborne magnetic and radiometric survey was carried out over the eastern portion of the island which contains the Umuna epithermal gold deposit.The purpose of the survey was to improve the understanding of surface and underlying geology and assist the regional mineral exploration of the area.In situ magnetic susceptibility measurements were taken within the survey area to determine the magnetic properties of the various Palaeocene-Miocene metasedimentary sequences and Miocene porphyritic felsic intrusives.The interpretation of the airborne magnetic data was constrained by susceptibility measurements, magnetic modelling and regional geological mapping. Computer processing included the use of reduction to the pole and pseudo gravimetric transforms.Variable density and type of vegetation cover on the island limited previous interpretations of the airborne radiometric data. The data was reprocessed using principal components analysis of the potassium and total count radiometric data.

Associations of Socioeconomic Status with Diet and Physical Activity in Migrant Bougainvilleans in Port Moresby, Papua New Guinea

2014 ◽  
Vol 53 (5) ◽  
pp. 471-483 ◽  
Author(s):  
Gwendalyn Vengiau ◽  
Masahiro Umezaki ◽  
Suparat Phuanukoonnon ◽  
Peter Siba ◽  
Chiho Watanabe
Keyword(s):  
Physical Activity ◽  
Socioeconomic Status ◽  
Papua New Guinea ◽  
New Guinea ◽  
Diet And Physical Activity ◽  
Port Moresby

scholarly journals Associations of Conflict-Related Trauma and Ongoing Stressors with the Mental Health and Functioning of West Papuan Refugees in Port Moresby, Papua New Guinea (PNG)

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0125178 ◽  
Author(s):  
Alvin Kuowei Tay ◽  
Susan Rees ◽  
Jack Chen ◽  
Moses Kareth ◽  
Sylvester Lahe ◽  
...  
Keyword(s):  
Mental Health ◽  
Papua New Guinea ◽  
New Guinea ◽  
Port Moresby

Systematic survey of K, Th, and U signatures in airborne radiometric data from Australian meteorite impact structures: Possible causes of circular features and implications

2021 ◽  
Author(s):  
Cheikh Ahmadou Bamba Niang ◽  
David Baratoux ◽  
Dina Pathé Diallo ◽  
Pierre Rochette ◽  
Mark W. Jessell ◽  
...  
Keyword(s):  
Case Studies ◽  
Crustal Deformation ◽  
Seismic Reflection ◽  
Gamma Ray ◽  
Mineral Exploration ◽  
Geological Mapping ◽  
Impact Event ◽  
Systematic Survey ◽  
The Impact ◽  
Radiometric Data

ABSTRACT Airborne radiometric (gamma-ray) data provide estimates of the concentrations of potassium (K), thorium (Th), and uranium (U) in soil, regolith, and bedrock. Radiometric data constitute an important source of geochemical information, commonly used in mineral exploration and for geological mapping of Earth and other planets. Airborne radiometric data have rarely been applied to the exploration and analyses of impact structures, in contrast with other conventional geophysical tools (e.g., gravimetry, magnetism, and seismic reflection/refraction). This work represents the first systematic survey of the K, Th, and U radiometric signatures of Australian impact structures, based on the continent-wide airborne radiometric coverage of Australia. We first formulated several hypotheses regarding the possible causes of formation of circular radiometric patterns associated with impact structures. Then, the radiometric signatures of 17 exposed impact structures in Australia were documented. Our observations confirmed the supposition that impact structures are commonly associated with circular radiometric patterns. We then selected the five structures with the most prominent circular radiometric patterns (Gosses Bluff, Lawn Hill, Acraman, Spider, and Shoemaker), and we discuss the possible origin of these anomalies. Based on these five case studies, we argue that such patterns result from either crustal deformation induced by the impact event and/or from postimpact superficial processes controlled by the crater topography. This work also suggests that airborne radiometric data may be useful, in combination with other geophysical tools, in the search for new possible impact structures.

Some chemical features of two Papuan fresh waters (Papua New Guinea)

1976 ◽  
Vol 27 (3) ◽  
pp. 467 ◽  
Author(s):  
T Petr
Keyword(s):  
River Water ◽  
Papua New Guinea ◽  
Chemical Weathering ◽  
New Guinea ◽  
Tropical River ◽  
Dominant Source ◽  
Sepik River ◽  
The World ◽  
Port Moresby ◽  
Total Salinity

The Purari River in Papua (Papua New Guinea) is a tropical river with ionic dominance similar to that of the world average river water, i.e. Ca > Mg > Na > K, and HCO3 > (SO4?) > Cl. As the sulphate concentration was not determined, the anionic trend still needs to be further investigated. The Na:Ca as well as the Ca + Mg:Na + K ionic ratios suggest that chemical weathering in the highlands is the dominant source of dissolved solids, and that it determines the chemistry of the lower course of the Purari River. Among the waters investigated, the Purari River, in its lower course, has a total salinity higher than that of the Sirinumu impoundment, and lower than that of the Sepik River. The low concentration of solutes in the Sirinumu impoundment near Port Moresby indicates that oligotrophication can be expected in reservoirs built on Papuan rivers.

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