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Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys

หน่วยงาน Central Queensland University, Australia

รายละเอียด

ชื่อเรื่อง : Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys
นักวิจัย : Guo, Wanwu. , Li, Zheng-Xiang. , Dentith, M. C.
คำค้น : Iron ores , TBA. , 840104 Iron Ore Exploration. , 890205 Information Processing Services (incl. Data Entry and Capture) , 970104 Expanding Knowledge in the Earth Sciences. , 040406 Magnetism and Palaeomagnetism. , 080110 Simulation and Modelling. , Magnetic prospecting. , Magnetic petrophysics -- NRM -- AMS -- Magnetic modelling -- Banded iron formation -- Hematite ore -- Hamersley Basin
หน่วยงาน : Central Queensland University, Australia
ผู้ร่วมงาน : -
ปีพิมพ์ : 2554
อ้างอิง : http://hdl.cqu.edu.au/10018/915981
ที่มา : Guo, W, Li, Z & Dentith, M 2011, 'Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys', Australian Journal of Earth Sciences, vol. 58, pp. 317-333, http://dx.doi.org/10.1080/08120099.2011.552984
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Australian journal of earth sciences. London : Taylor & Francis, 2011. Vol. 58, (2011), p. 317-333 17 pages Refereed 0812-0099 1440-0952 (online) , ACQUIRE [electronic resource] : Central Queensland University Institutional Repository.
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

An extensive magnetic petrophysical investigation was carried out in the Hamersley Basin in Western Australia; which hosts large high-grade iron-ore deposits derived from banded iron formations (BIFs). Based on our new results, as well as those from previous studies, we demonstrate that the bulk susceptibility of BIF units has a bimodal distribution caused by the presence of chert-rich and magnetite-rich bands. The mean bulk susceptibility (MBS) of magnetite-rich bands is more than 10 times higher than that of chert-rich bands. Measurements of anisotropy of magnetic susceptibility (AMS) in BIF units show this to vary between 1.06 and 2.76. The natural remanent magnetisation (NRM) carried by iron ores varies with different deposits, and even within individual deposits. NRM measurements on nonore units defined a northwesterly upward regional magnetic overprint (3108/–278) present in the Fortescue and Hamersley Groups, and also in the lower Wyloo Group. Modelling of aeromagnetic data over the Hamersley Range demonstrates that the effects of AMS and NRM are significant and must be accounted for. The effects of AMS and NRM on magnetic anomalies due to BIFs depend on the volume fraction of magnetite-rich members in a BIF unit. Forward modelling of magnetic and gravity responses, using petrophysical results summarised in this study, over a mined hematite ore deposit in Tom Price indicates that TMI variations are expected to be significantly reduced in areas of mineralisation. However, magnetic data alone are not a reliable indicator of the presence of mineralisation because of other causes of reduced magnetism in BIFs.

บรรณานุกรม :
Guo, Wanwu. , Li, Zheng-Xiang. , Dentith, M. C. . (2554). Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys.
    กรุงเทพมหานคร : Central Queensland University, Australia.
Guo, Wanwu. , Li, Zheng-Xiang. , Dentith, M. C. . 2554. "Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys".
    กรุงเทพมหานคร : Central Queensland University, Australia.
Guo, Wanwu. , Li, Zheng-Xiang. , Dentith, M. C. . "Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys."
    กรุงเทพมหานคร : Central Queensland University, Australia, 2554. Print.
Guo, Wanwu. , Li, Zheng-Xiang. , Dentith, M. C. . Magnetic petrophysical results from the Hamersley Basin and their implications for interpretation of magnetic surveys. กรุงเทพมหานคร : Central Queensland University, Australia; 2554.