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  5. <title>UTas ePrints - Fluid Inclusion and Noble Gas Studies of the Dongping Gold Deposit, Hebei Province, China: A Mantle Connection for Mineralization?</title>
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  31. <meta content="Fluid Inclusions; Gold; Noble Gases; Dongping; Hebei Province; China" name="eprints.keywords" />
  32. <meta content="The Dongping gold deposit (>100 t Au) occurs about 200 km inboard of the northern margin of the North
  33. China craton. The deposit is mainly hosted by syenite of a middle Paleozoic alkalic intrusive complex that was
  34. emplaced into Late Archean basement rocks. Both groups of rocks are intruded by Late Jurassic to Early Cretaceous
  35. crustal-melt granite dikes and stocks, some within a few kilometers of the deposit. The gold ores were
  36. deposited during this latter magmatic period at about 150 Ma, a time that was characterized by widespread regional
  37. north-south compression that formed the east-west–trending Yanshan deformational belt. The ores include
  38. both the telluride mineral-bearing, low sulfide quartz veins and the highly K-feldspar–altered syenite,
  39. with most of the resource concentrated in two orebodies (1 and 70).
  40. Fluid inclusion microthermometry indicates heterogeneous trapping of low-salinity (e.g., 5–7 wt % NaCl
  41. equiv) fluids that varied from a few to 60 mole percent nonaqueous volatile species. Laser Raman spectroscopy
  42. confirms that the vapor phase in these inclusions is dominated by CO2 but may be comprised of as much as 9
  43. mole percent H2S and 20 mole percent N2; methane concentrations in the vapor phase are consistently <1 mole
  44. percent. The variable phase ratios are consistent with fluid immiscibility during ore formation. Fluid inclusion
  45. trapping conditions are estimated to be 250° to 375°C and 0.6 to 1.0 kbar. Helium isotope studies of fluid inclusions
  46. in ore-stage pyrites indicate 3He/4He ratios of 2.1 to 5.2 Ra (Ra = 1.4 × 10–6 for air) for orebody 1 and
  47. 0.3 to 0.8 Ra for orebody 70. The former data suggest that at least 26 to 65 percent mantle helium occurs in
  48. the fluids that deposited the veins in orebody 1. The lower values for orebody 70, which is characterized by a
  49. more disseminated style of gold mineralization, are interpreted to reflect an increased interaction of ore fluids
  50. with surrounding crustal rocks, which may have contributed additional 4He to the fluids.
  51. A mantle source for at least some of the components of the gold-forming fluid is consistent with upwelling of
  52. hot asthenosphere and erosion of as much as 100 to 150 km of cool Archean lithosphere beneath the craton during
  53. this time. The Dongping deposit is located along the 100-km-wide north-south gravity lineament, which
  54. marks the western border of the thinned crust. As both regional metamorphism of Mesoproterozoic and younger
  55. cover rocks, and widespread granite magmatism, also occurred at ca. 150 Ma, it is unclear as to whether one or
  56. both of these also contributed fluid and/or metals to the hydrothermal system. Importantly, these new data suggest
  57. that economically significant gold deposits of similar mineral style and fluid composition, which are scattered
  58. along the margins of the craton, may all be products of a fluid originally partly sourced within the mantle." name="eprints.abstract" />
  59. <meta content="2003-05" name="eprints.date" />
  60. <meta content="published" name="eprints.date_type" />
  61. <meta content="Economic Geology" name="eprints.publication" />
  62. <meta content="98" name="eprints.volume" />
  63. <meta content="3" name="eprints.number" />
  64. <meta content="517-534" name="eprints.pagerange" />
  65. <meta content="10.2113/98.3.517" name="eprints.id_number" />
  66. <meta content="TRUE" name="eprints.refereed" />
  67. <meta content="0361-0128" name="eprints.issn" />
  68. <meta content="http://dx.doi.org/10.2113/98.3.517" name="eprints.official_url" />
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  324. the Altaid orogenic collage: the Tien Shan province as a key example: Society
  325. of Economic Geologists, Special Publication 9, p. 177–201.
  326. Yue, Y., Liou, J.G., and Graham, S.A., 2001, Tectonic correlation of the Beishan
  327. and Inner Mongolia orogens and its implications for the palinspastic
  328. reconstruction of north China: Geological Society of America Memoir 194,
  329. p. 101–116.
  330. Zhang, W., and Chen, Z., 1993, Geology of fluid inclusions: Wuhan, China
  331. University of Geosciences Press, p. 83–92 and p. 107–156 (in Chinese).
  332. Zhang, Z., 1997, Isotope geochemical characteristics of the Shuiquangou
  333. complex in northern Hebei and its genetic significance: Journal of
  334. Changchun University of Earth Sciences, v. 27, p. 36–42 (in Chinese).
  335. Zhang, Z., and Mao, J., 1995, Geology and geochemistry of the Dongping
  336. gold telluride deposit, Hebei province, North China: International Geology
  337. Reviews, v. 37, p. 1094–1108.
  338. Zhao, S., 1996, Geological characteristics of the Dongping gold deposit,
  339. northern Hebei: Gold Geology, v. 2, p. 22–26 (in Chinese).
  340. Zhou, T., Goldfarb, R.J., and Phillips, G.N., 2002, Tectonics and distribution
  341. of gold deposits in China—an overview: Mineralium Deposita, v. 37, p.
  342. 249–282." name="eprints.referencetext" />
  343. <meta content="Mao, J. and Li, Y. and Goldfarb, R. and He, Y. and Zaw, K. (2003) Fluid Inclusion and Noble Gas Studies of the Dongping Gold Deposit, Hebei Province, China: A Mantle Connection for Mineralization? Economic Geology, 98 (3). pp. 517-534. ISSN 0361-0128" name="eprints.citation" />
  344. <meta content="http://eprints.utas.edu.au/2066/1/Mao.Li.Goldfarb.etal.ECONGEOL.2003.pdf" name="eprints.document_url" />
  345. <link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" />
  346. <meta content="Fluid Inclusion and Noble Gas Studies of the Dongping Gold Deposit, Hebei Province, China: A Mantle Connection for Mineralization?" name="DC.title" />
  347. <meta content="Mao, J." name="DC.creator" />
  348. <meta content="Li, Y." name="DC.creator" />
  349. <meta content="Goldfarb, R." name="DC.creator" />
  350. <meta content="He, Y." name="DC.creator" />
  351. <meta content="Zaw, K." name="DC.creator" />
  352. <meta content="260100 Geology" name="DC.subject" />
  353. <meta content="The Dongping gold deposit (>100 t Au) occurs about 200 km inboard of the northern margin of the North
  354. China craton. The deposit is mainly hosted by syenite of a middle Paleozoic alkalic intrusive complex that was
  355. emplaced into Late Archean basement rocks. Both groups of rocks are intruded by Late Jurassic to Early Cretaceous
  356. crustal-melt granite dikes and stocks, some within a few kilometers of the deposit. The gold ores were
  357. deposited during this latter magmatic period at about 150 Ma, a time that was characterized by widespread regional
  358. north-south compression that formed the east-west–trending Yanshan deformational belt. The ores include
  359. both the telluride mineral-bearing, low sulfide quartz veins and the highly K-feldspar–altered syenite,
  360. with most of the resource concentrated in two orebodies (1 and 70).
  361. Fluid inclusion microthermometry indicates heterogeneous trapping of low-salinity (e.g., 5–7 wt % NaCl
  362. equiv) fluids that varied from a few to 60 mole percent nonaqueous volatile species. Laser Raman spectroscopy
  363. confirms that the vapor phase in these inclusions is dominated by CO2 but may be comprised of as much as 9
  364. mole percent H2S and 20 mole percent N2; methane concentrations in the vapor phase are consistently <1 mole
  365. percent. The variable phase ratios are consistent with fluid immiscibility during ore formation. Fluid inclusion
  366. trapping conditions are estimated to be 250° to 375°C and 0.6 to 1.0 kbar. Helium isotope studies of fluid inclusions
  367. in ore-stage pyrites indicate 3He/4He ratios of 2.1 to 5.2 Ra (Ra = 1.4 × 10–6 for air) for orebody 1 and
  368. 0.3 to 0.8 Ra for orebody 70. The former data suggest that at least 26 to 65 percent mantle helium occurs in
  369. the fluids that deposited the veins in orebody 1. The lower values for orebody 70, which is characterized by a
  370. more disseminated style of gold mineralization, are interpreted to reflect an increased interaction of ore fluids
  371. with surrounding crustal rocks, which may have contributed additional 4He to the fluids.
  372. A mantle source for at least some of the components of the gold-forming fluid is consistent with upwelling of
  373. hot asthenosphere and erosion of as much as 100 to 150 km of cool Archean lithosphere beneath the craton during
  374. this time. The Dongping deposit is located along the 100-km-wide north-south gravity lineament, which
  375. marks the western border of the thinned crust. As both regional metamorphism of Mesoproterozoic and younger
  376. cover rocks, and widespread granite magmatism, also occurred at ca. 150 Ma, it is unclear as to whether one or
  377. both of these also contributed fluid and/or metals to the hydrothermal system. Importantly, these new data suggest
  378. that economically significant gold deposits of similar mineral style and fluid composition, which are scattered
  379. along the margins of the craton, may all be products of a fluid originally partly sourced within the mantle." name="DC.description" />
  380. <meta content="2003-05" name="DC.date" />
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  386. <meta content="Mao, J. and Li, Y. and Goldfarb, R. and He, Y. and Zaw, K. (2003) Fluid Inclusion and Noble Gas Studies of the Dongping Gold Deposit, Hebei Province, China: A Mantle Connection for Mineralization? Economic Geology, 98 (3). pp. 517-534. ISSN 0361-0128" name="DC.identifier" />
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  491. <h1 class="ep_tm_pagetitle">Fluid Inclusion and Noble Gas Studies of the Dongping Gold Deposit, Hebei Province, China: A Mantle Connection for Mineralization?</h1>
  492. <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Mao, J.</span> and <span class="person_name">Li, Y.</span> and <span class="person_name">Goldfarb, R.</span> and <span class="person_name">He, Y.</span> and <span class="person_name">Zaw, K.</span> (2003) <xhtml:em>Fluid Inclusion and Noble Gas Studies of the Dongping Gold Deposit, Hebei Province, China: A Mantle Connection for Mineralization?</xhtml:em> Economic Geology, 98 (3). pp. 517-534. ISSN 0361-0128</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2066/1/Mao.Li.Goldfarb.etal.ECONGEOL.2003.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2066/1/Mao.Li.Goldfarb.etal.ECONGEOL.2003.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />427Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2605" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.2113/98.3.517">http://dx.doi.org/10.2113/98.3.517</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The Dongping gold deposit (&gt;100 t Au) occurs about 200 km inboard of the northern margin of the North&#13;
  493. China craton. The deposit is mainly hosted by syenite of a middle Paleozoic alkalic intrusive complex that was&#13;
  494. emplaced into Late Archean basement rocks. Both groups of rocks are intruded by Late Jurassic to Early Cretaceous&#13;
  495. crustal-melt granite dikes and stocks, some within a few kilometers of the deposit. The gold ores were&#13;
  496. deposited during this latter magmatic period at about 150 Ma, a time that was characterized by widespread regional&#13;
  497. north-south compression that formed the east-west–trending Yanshan deformational belt. The ores include&#13;
  498. both the telluride mineral-bearing, low sulfide quartz veins and the highly K-feldspar–altered syenite,&#13;
  499. with most of the resource concentrated in two orebodies (1 and 70).&#13;
  500. Fluid inclusion microthermometry indicates heterogeneous trapping of low-salinity (e.g., 5–7 wt % NaCl&#13;
  501. equiv) fluids that varied from a few to 60 mole percent nonaqueous volatile species. Laser Raman spectroscopy&#13;
  502. confirms that the vapor phase in these inclusions is dominated by CO2 but may be comprised of as much as 9&#13;
  503. mole percent H2S and 20 mole percent N2; methane concentrations in the vapor phase are consistently &lt;1 mole&#13;
  504. percent. The variable phase ratios are consistent with fluid immiscibility during ore formation. Fluid inclusion&#13;
  505. trapping conditions are estimated to be 250° to 375°C and 0.6 to 1.0 kbar. Helium isotope studies of fluid inclusions&#13;
  506. in ore-stage pyrites indicate 3He/4He ratios of 2.1 to 5.2 Ra (Ra = 1.4 × 10–6 for air) for orebody 1 and&#13;
  507. 0.3 to 0.8 Ra for orebody 70. The former data suggest that at least 26 to 65 percent mantle helium occurs in&#13;
  508. the fluids that deposited the veins in orebody 1. The lower values for orebody 70, which is characterized by a&#13;
  509. more disseminated style of gold mineralization, are interpreted to reflect an increased interaction of ore fluids&#13;
  510. with surrounding crustal rocks, which may have contributed additional 4He to the fluids.&#13;
  511. A mantle source for at least some of the components of the gold-forming fluid is consistent with upwelling of&#13;
  512. hot asthenosphere and erosion of as much as 100 to 150 km of cool Archean lithosphere beneath the craton during&#13;
  513. this time. The Dongping deposit is located along the 100-km-wide north-south gravity lineament, which&#13;
  514. marks the western border of the thinned crust. As both regional metamorphism of Mesoproterozoic and younger&#13;
  515. cover rocks, and widespread granite magmatism, also occurred at ca. 150 Ma, it is unclear as to whether one or&#13;
  516. both of these also contributed fluid and/or metals to the hydrothermal system. Importantly, these new data suggest&#13;
  517. that economically significant gold deposits of similar mineral style and fluid composition, which are scattered&#13;
  518. along the margins of the craton, may all be products of a fluid originally partly sourced within the mantle.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Fluid Inclusions; Gold; Noble Gases; Dongping; Hebei Province; China</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences &gt; 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2066</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mrs Katrina Keep</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">09 Oct 2007 21:13</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2066;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=2066">item control page</a></p>
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