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Articles 1 - 4 of 4
Full-Text Articles in Social and Behavioral Sciences
Heavy Minerals In Modern Sediments Of The Minnamurra Estuary And Shelf Environment, Nsw, Australia, Rabea Haredy, Brian Jones, Adrian Hutton
Heavy Minerals In Modern Sediments Of The Minnamurra Estuary And Shelf Environment, Nsw, Australia, Rabea Haredy, Brian Jones, Adrian Hutton
B. G. Jones
Provenance and sediment distribution have been investigated in the Minnamurra estuary and the adjacent shelf in NSW, Australia. Heavy mineral assemblages in the sand fractions (63-250 f.lm) of 110 surficial sediment samples were assessed using microscopic and microprobe analyses. In addition to the dominant opaque minerals, twelve translucent heavy mineral species were identified. The translucent assemblage is dominated by pyroxene, zircon, tourmaline and hornblende. Statistical cluster analysis of heavy mineral percentages in the surficial sediments revealed the existence of five mineralogical facies: the upper fluvial part of the estuary, the Minnamurra spit and elevated inner sand terrace, the estuary inlet …
The Tectonic Evolution Of A Neo-Tethyan (Eocene-Oligocene) Island-Arc (Walash And Naopurdan Groups) In The Kurdistan Region Of The Northeast Iraqi Zagros Suture Zone, Sarmad Ali, Solomon Buckman, K Aswad, Brian Jones, Sabah Ismail, Allen Nutman
The Tectonic Evolution Of A Neo-Tethyan (Eocene-Oligocene) Island-Arc (Walash And Naopurdan Groups) In The Kurdistan Region Of The Northeast Iraqi Zagros Suture Zone, Sarmad Ali, Solomon Buckman, K Aswad, Brian Jones, Sabah Ismail, Allen Nutman
B. G. Jones
The Walash and Naopurdan groups are incorporated into the lower allochthonous thrust sheet in the Iraqi Zagros Suture Zone (IZSZ). 40Ar–39Ar dates on magmatic feldspar separates from both Walash and Naopurdan volcanic rocks indicate an Eocene–Oligocene age (43.01 ± 0.15 to 24.31 ± 0.60 Ma). The Walash and Naopurdan groups form a thrust sheet that is structurally overlain by an upper allochthon of Cretaceous arc-related rocks (106–92 Ma) now known as the Hasanbag igneous complex (formerly known as the Gemo–Qandil Group). The Walash and Naopurdan lower allochthon is thrust over the foreland basin Red Beds series. Volcanic and subvolcanic units …
The Chronostratigraphy Of A Holocene Barrier Estuary: Lake Illawarra Nsw, Craig Sloss, Brian Jones, Colin Murray-Wallace, Charles Mcclennan
The Chronostratigraphy Of A Holocene Barrier Estuary: Lake Illawarra Nsw, Craig Sloss, Brian Jones, Colin Murray-Wallace, Charles Mcclennan
B. G. Jones
Valley-fill sequences, preserved in topographic lows associated with incised valley systems, potentially preserve a record of Holocene sea level fluctuations. A detailed litho- and biostratigraphy of the Holocene barrier estuary, Lake Illawarra, New South Wales has been constructed. Forty kilometres of seismic surveys, forty-one vibracores, supplemented by auger drill holes and trenches, and faunal analysis provides the data for this investigation. A detailed chronology of the infilling of the barrier estuary has been established using 115 aspartic acid derived ages and six radiocarbon ages. The results provide a detailed chronology for the deposition of marine transgressive deposits, barrier growth, and …
Trace Metals In Sediments From Lake Illawarra, New South Wales, Australia, Bryan Chenhall, Brian Jones, Craig Sloss, Mark O'Donnell, Marrack Payne, Mark Murrie, David Garnett, Helen Waldron
Trace Metals In Sediments From Lake Illawarra, New South Wales, Australia, Bryan Chenhall, Brian Jones, Craig Sloss, Mark O'Donnell, Marrack Payne, Mark Murrie, David Garnett, Helen Waldron
B. G. Jones
Sediments in Lake Illawarra have been investigated by deep and shallow coring to provide a comprehensive appraisal of the sediment-bound natural (background) and more recent (i.e., industrial era) trace metal concentrations. The distribution of Cu, Pb and Zn in the upper 20 cm of sediment is directly related to the proportion of mud-dominated sediment forming the central floor of the lake. Trace metal enrichment factors for Cu, Pb and Zn were generally less than 2.5 with the exception of the southern portion of Griffins Bay where the factors were greater than 1.8, 3.5 and 5.8 for Cu, Pb and Zn …