Mineralogy, geochemistry, and genesis of the bauxite deposits on the Gove and Mitchell Plateaux, northern Australia

Grubb, P. L. C.

doi:10.1007/bf00201991

Cited by 17 publications

(9 citation statements)

References 14 publications

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“…The Gove plateau appears to have undergone late‐stage planing after the formation of the bauxite (Somm ). Late‐stage planing of the plateau surface, predominantly involving the loose pisolitic bauxite horizon, is consistent with the opinion of Grubb () who, on the basis of mineralogy, suggested that some redistribution of bauxite had occurred.…”

Section: Terrestrial Agesupporting

confidence: 88%

The Gove relict iron meteorite from Arnhem Land, Northern Territory, Australia

Bevan

Downes

Henry

et al. 2019

Meteorit & Planetary Scien

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On February 24, 1979, a deeply oxidized mass of iron meteorite was excavated from bauxite at an open cut mine on the Gove Peninsula, Northern Territory, Australia. The meteorite, measuring 0.75–1 m in diameter and of unknown total weight, was found at coordinates 12°15.8′S, 136°50.3′E. On removal from the ground, the meteorite is reported to have disintegrated rapidly. A preliminary analysis at the mine laboratory reportedly gave 8.5 wt% Ni. A modern analysis of oxidized material gave Ni = 32.9, Co = 3.67 (both mg g−1), Cr = 168, Cu = 195, Ga = 22.5, Ge = <70, As = 4.16, W = 1.35, Ir = 10.5, Pt = 21.2, Au = 0.672 (all μg g−1), Sb = <150, and Re = 844 (both ng g−1). Competent fragments of oxidized material retain a fine to medium Widmanstätten pattern with an apparent average bandwidth of 0.5 mm (range 0.2–0.9 mm in plane section). Primary mineralogy includes rare γ–taenite and daubréelite, and secondary minerals produced by weathering include awaruite (with up to 78.5 wt% Ni) and an, as yet, unnamed Cu‐Cr‐bearing sulfide with the ideal formula CuCrS2 that is hitherto unknown in nature. Deep weathering has masked many of the features of the meteorite; however, the analysis normalized to the analyses of fresh iron meteorites favors chemical group IIIAB. The terrestrial age of the meteorite is unknown, although it is likely to be in the Neogene (2.5–23 Ma), which is widely accepted as the major period of bauxite formation in the Northern Territory of Australia. Gove is the second authenticated relict meteorite found in Australia.

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Section: Terrestrial Agesupporting

confidence: 88%

The Gove relict iron meteorite from Arnhem Land, Northern Territory, Australia

Bevan

Downes

Henry

et al. 2019

Meteorit & Planetary Scien

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“…The most striking feature o£ the Weipa bauxite deposits is their characteristic loose pisolidc texture, which to all intents and purposes is (GRuBB 1970). On the other hand there is a conspicious dearth of type 'B' and 'C' horizons, although a relatively thin coarse concretionary limonitic zone separates the pisolitic bauxite from the underlying mottled or pallid zone sandy clays.…”

Section: Lithologymentioning

confidence: 97%

Genesis of the Weipa Bauxite deposits, N. E. Australia

Grubb

1971

Mineral. Deposita

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Mineralogical variations both in vertical profile and bulk sized samples at Weipa are similar in broad outline, but show significant variations in detail. Surface planation has been limited and confined mainly to the limbs of a broad synclinal warp at Andoom and Pera Head. Whereas the proportional increase in boehmite within the upper levels of the pisolitic bauxite may in part be correlated with the degree of subsequent surface planation, other factors such as thickness of profile, size fraction distribution, and quartz sand content also play an essential role. The significance of underlying rock porosity is emphasised together with the special geomorphic conditions induced by warping here. It is concluded that leaching conditions were less dynamic than at Gore and that this accounts in large part for both the high boehmite content and lithological relationships of the Weipa bauxite.Die Bauxite yon Weipa sind sowohl im senkrechten Profil, wie auch in groBen gesiebten Proben generell fihntich, weisen aber im Detail wichtige Unterschiede auf. Die Oberfl~ichen-Erosion hat sich haupts~chlich auf die breiten Muldenflfigel der synklinalen Mulde in Andoom und Pera Head ausgewirkt. W~hrend die Zunahme yon Boehmit in den oberen Schichten des pisolitischen Bauxits teilweise mit dem der Oberfl~ichen-Erosion verkniipft sein kann, k6nnen andere Faktoren, wie die Miichtigkeit des Profils, groge Bruchverteilung und der Quarz-Sand-Gehalt ebenfaIls eine wichtige Rolle spielen. Die Bedeutung der Fels-Porosit~it wird hervorgehoben, zusammen mit den speziellen geomorphologischen Bedingungen, die durch Einmuldung herbeigeftihrt werden. Es ergibt sich, dab die Auslaugevorg~nge weniger dynamisch waren, als in Gore und zum grol3en Tell sowohl den hohen Boehmit-Gehalt, wie auch die lithologische Verwandtschaft der Weipa-Bauxite erkl~ren.

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“…Pembentukkan bauksit di Johor juga wujud dalam bentuk konkresi (Grubb, 1982). Mineral sekunder yang mengikut kelimpahannya dalam konkresi ialah gibsit, boehmit, goetit, hematit dan kaolinit (Grubb, 1970;Tardy dan Nahon, 1985;Trolard dan Tardy, 1989;Nahon, 1991dan Mordberg, 1993a. Kajian kepekatan dan perlakuan unsur-unsur surih dalam bauksit pernah dilaporkan oleh Wolfenden (1965) dan Mordberg (1993aMordberg ( dan 1993b.…”

Section: Gjunclassified

Kajian geokimia konkresi dan hubungannya dengan pembentukkan bauksit di kawasan Kuantan

Musta¹,

Hassan²,

Tan³

1997

BGSM

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Proses luluhawa kimia pada batuan basalt di kawasan Kuantan telah menghasilkan konkresi. Sebanyak 21 sampel konkresi tersebut yang diambil daripada 5 profilluluhawa telah dianalis kandungan unsur major dan unsur surih. Keputusan menunjukkan Al 2 0 a dan Fe 2 0 S merupakan unsur yang melimpah denganjulat kepekatan masing-masing 32.35%-52.23% dan 14.96%-33.99%. Kepekatan Ti0 2 pula berjulat 3.030/ 0-6 .62% manakala Si0 2 berjulat bdl-8.07%. Unsur-unsur MgO , CaO, Nap dan ~O kebanyakannya di bawah had pengesanan (bdl). Si0 2 , FeO, MnO dan P 2 0 5 masih boleh dikes an dalam sampel tetapi kebanyakannya kurang daripada 1%. Kesimpulan yang boleh dibuat berdasarkan data geokimia unsur major ialah konkresi tersebut adalah berkomposisi bauksit, dengan Al 2 0 S ' Feps' Si0 2 dan Ti0 2 sebagai unsur pembentuk mineral yang utama. Mineral yang melimpah dan dikes an mengikut pertambahan kelimpahannya ialah gibsit, hematit, goetit, kaolinit dan kuarza. Korelasi negatif yang kuat antara Fe 2 0 S lawan Al 2 0 S dan Al 2 0 S lawan Ti0 2 m encadangkan pertambahan Al 2 0 S membentuk gibsit akan diikuti dengan pengurangan goetit dan anatas. Purata kepekatan masing-masing bagi Cr, Zn, Ni dan Cu dalam konkresi ialah 611 ppm, 35 ppm, 35 ppm dan 28 ppm. Korelasi positif yang ditunjukkan oleh plot graf Ni lawan Zn, Ni lawan Cu dan Zn lawan Cu dalam konkresi mencadangkan asosiasi unsur-unsur tersebut dalam bauksit, terutamanya dalam mineral gibsit dan goetit. Cr kemungkinan dijerap dalam gibsit, Fe-oksida dan kaolinit, dan juga boleh terdapat dalam kromit.

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Mineralogy, geochemistry, and genesis of the bauxite deposits on the Gove and Mitchell Plateaux, northern Australia

Cited by 17 publications

References 14 publications

The Gove relict iron meteorite from Arnhem Land, Northern Territory, Australia

The Gove relict iron meteorite from Arnhem Land, Northern Territory, Australia

Genesis of the Weipa Bauxite deposits, N. E. Australia

Kajian geokimia konkresi dan hubungannya dengan pembentukkan bauksit di kawasan Kuantan

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