Petroleum Resources of Papua New Guinea     

Simon A. Kawagle 《Resource Geology》2007,57(3):347-350

Papua New Guinea’s petroleum sector has substantially grown in the last 2 years. There is an increase in exploration expenditure, which also sees a corresponding increase in the number of exploration licences. Two new petroleum projects have been commissioned and these have added to production of the existing projects. The oilfields are small by world standards. The sector is the second major contributor to the export income and taxation revenue of the country, after minerals.  相似文献   

Nature of sediment dispersal off the Sepik River, Papua New Guinea: preliminary sediment budget and implications for margin processes     

Steven A. Kuehl  Gregg J. Brunskill  Kathy Burns  David Fugate  Tara Kniskern  Linda Meneghini 《Continental Shelf Research》2004,24(19):2417-2429

A sediment budget is constructed for the slope and narrow continental shelf off the Sepik River in order to estimate the relative importance of turbid plumes versus bottom gravity transport through a near-shore submarine canyon in the dispersal of sediment across this collision margin. ²¹⁰Pb geochronology and inventories of Kasten cores are consistent with the northwestward dispersal of sediment from the river mouth via hypopycnal and possible isopycnal plumes. Sediment accumulation rates are 5 cm yr⁻¹ on the upper slope just off of the Sepik mouth, decreasing gradually to 1 cm yr⁻¹ toward the northwest, and decreasing abruptly offshore (<0.2 cm yr⁻¹ at 1200 m water depth). A sediment budget indicates that only about 7–15% of the Sepik River sediment discharge accumulates on the adjacent open shelf and slope. The remainder presumably escapes offshore via gravity flows through a submarine canyon, the head of which extends into the river mouth. The divergent sediment pathways observed off the Sepik River (i.e., surface and subsurface plumes versus sediment gravity flows through a canyon) may be common along high-yield collision margins of the Indo–Pacific archipelago, and perhaps are analogous to most margins during Late Quaternary low sea-level conditions.  相似文献   

Cave sedimentation in the new Guinea highlands     

David Gillieson 《地球表面变化过程与地形》1986,11(5):533-543

This paper investigates the nature and processes of sedimentation of allogenic cave deposits in the high relief, everwet karsts of montane New Guinea. Under the high intensity rainfall regime, episodic mass movements in small karst catchments provide a wide range of sediment textures from clayey gravels to fine clays. These allogenic sediments are deposited into pools of water within the caves, giving sedimentary structures analogous to turbidites. Diamictons within the cave relate to episodic mudflows in the catchment. These deposits move as fluidized masses in a manner similar to some esker deposits. Cross-stratified sediments are formed by dumping of pulses of sediment laden water into deep pools. Extremely fine-grained clays and muds accrete parallel to underlying surfaces following flood pulses. These deposits represent the last phase of catchment instability, when a small amount of slopewash occurs. Catchment processes are dominated by solution and episodic mass movements. When the thick root mat which masks the ground is disrupted, some slopewash occurs but it is not a major component in catchment processes.  相似文献   

Diatom-temperature transfer functions based on the altitudinal zonation of diatom assemblages in Papua New Guinea: a possible tool in the reconstruction of regional palaeoclimatic changes     

Wim Vyverman  Koen Sabbe 《Journal of Paleolimnology》1995,13(1):65-77

Indirect and direct gradient ordination techniques were used to study the relationship between present-day benthic and periphytic diatom assemblages and environmental factors along an altitudinal gradient in Papua New Guinea. Both within the screened initial data-set and a narrowly-defined subset of soft-water lakes, shifts in diatom assemblages are clearly related to altitudinal differences. This relation is used to construct transfer functions for inferring altitude (and hence average water temperature) from the diatom records. Calibration by canonical correspondence analysis (CCA) and simple weighted averaging calibration proved to be superior to models using WA with tolerance downweighting and to a simple WA model based on a selection of 52 indicator taxa. From the calibration models and the linear relationship between altitude and epilimnetic water temperature, the average lake water temperature can be predicted with an accuracy of 3.2°C. After further refinement, a transfer function for palaeotemperature based on diatoms would be of potential value for climatic reconstructions in tropical regions.  相似文献   

The Mineral Resources of Papua New Guinea     

Simon A. Kawagle 《Resource Geology》2005,55(3):285-288

Abstract. Papua New Guinea is geologically highly prospective for minerals. There are three world class, open pit mines located at Ok Tedi, Porgera and Lihir, and two medium-scale underground operations at Tolukuma and Kainantu. Two other mining projects - Ramu and Simberi are fully licensed and will be mined in the next 6–12 months. The mining sector is the major contributor to the export income and taxation revenue of the country.  相似文献   

Spectral Characterisation of Tsunamis and Seiches Caused by Tectonism and Volcanism in Rabaul,Papua New Guinea     

Sinadinovsk  C.  Somerville  M.  McCue  K. F.  Talai  B. 《Natural Hazards》2001,24(3):285-294

Tsunamis originating in Indonesia and Papua New Guinea can be locally devastating and also occasionally threaten coastal areas of northern Australia. Tsunamis may be caused by earthquakes, volcanoes or submarine landslides. In Rabaul a unique set of records exists of tsunamis and seiches generated by tectonic earthquakes, volcanic earthquakes and a volcanic eruption. Spectral analysis of the digitised waveforms has been undertaken to compare the effects of the different sources and to estimate the characteristic natural periods of Rabaul Harbour. Seiches in Rabaul Harbourhave dominant periods of 20 to 30 min, a period band that is also typical for coastal recordings of tsunamis.  相似文献   

1998年7～9月的全球地震动态     

吴佳翼 《国际地震动态》1999,(3):10-12

１９９８年第三季度,全球地震活动仍为中等水平,新几内亚北部近海和厄瓜多尔近海各发生一次７级以上地震,亚速尔群岛发生一次６级以上的地震,全球中等以上地震活动无异常现象。  相似文献   

几内亚某超大型铝土矿含水地层钻探取样技术     

李旭庆 《地质与勘探》2012,48(2):374-378

[摘 要] 为解决在几内亚某特大型铝土矿矿区部分含水区域中钻探施工中出现的取样困难的问题,通过对含水钻孔地层的地质特征分析,将其分为三种类型,并据此研制和试验了两种不同的取样钻具:护带型螺旋钻具和可启闭防抽吸钻具。经过现场实验证明,护带型螺旋钻具适宜于第一种地质特征的钻孔,可启闭防抽吸钻具适宜于第二、三类地质特征的钻孔。在施工应用中,解决了在该矿区这类地层中钻探取样问题。  相似文献   

A first look at oxygen isotope records from modern and Holocene-aged gastropod (Stenomelania) shells from Lake Kutubu,Papua New Guinea     

Kelsie Long  Larissa Schneider  Ian S. Williams  Stewart J. Fallon  Hilary Stuart-Williams  Simon Haberle 《第四纪科学杂志》2020,35(3):457-464

The oxygen isotopic composition of Stenomelania gastropod shells was investigated to reconstruct Holocene palaeoclimate change at Lake Kutubu in the southern highlands of Papua New Guinea. Oxygen isotope (δ¹⁸O) values recorded in aquatic gastropod shells change according to ambient water δ¹⁸O values and temperature. The gastropod shells appear to form in oxygen isotopic equilibrium with the surrounding water and record a shift in average shell oxygen isotopic composition through time, probably as a result of warmer/wetter conditions at ca. 600–900 and 5900–6200 cal a bp. Shorter term fluctuations in oxygen isotope values were also identified and may relate to changes in the intensity or source of rainfall. Further δ¹⁸O analyses of gastropod shells or other carbonate proxies found in the Lake Kutubu sediments are warranted. © 2020 John Wiley & Sons, Ltd.  相似文献   

Reef microhabitats mediate fish feeding intensity and agonistic interactions at Príncipe Island Biosphere Reserve,Tropical Eastern Atlantic     

Angela Marina Canterle  Lucas Teixeira Nunes  Luisa Fontoura  Hugulay Albuquerque Maia  Sergio Ricardo Floeter 《Marine Ecology》2020,41(5):e12609

The benthic assemblage of reefs provides an important resource of food and habitat for reef fishes. However, how benthic composition mediates reef fishes' biotic interactions at isolated environments such as oceanic islands remains largely unknown. Here, we aimed to investigate the role of four different reef microhabitats over biological interactions of fishes in an understudied oceanic island, Príncipe Island. For that, we recorded a total of 46 Underwater Remote Videos (RUVs) to document benthic composition and fishes' trophic and agonistic interactions. We used benthic cover estimates to group the samples into four microhabitats (dominated by epilithic algal matrix [EAM], sand/rock, corals and sponges), then quantified fishes' trophic and agonistic interactions in each microhabitat. All microhabitats presented a different structure of trophic and agonistic interactions of the fish assemblage. Feeding pressure (FP) and agonistic interactions were higher on the EAM microhabitat and lower in coral microhabitat. Herbivores were the main responsible group for the FP in all microhabitats. Territorial damselfishes used microhabitats differently for both trophic and agonistic interactions. We demonstrated that reef fish diversity and intensity of biotic interactions varied according the spatial distribution of benthic resources, which suggests that benthic composition plays an important role on structuring biological interactions at isolated reef systems.  相似文献