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  5.     <title>UTas ePrints - The Himalayan Yulong Porphyry Copper Belt: Product of Large-Scale Strike-Slip Faulting in Eastern Tibet</title>
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  33. <meta content="The Himalayan Yulong Porphyry Copper Belt:
  34. Product of Large-Scale Strike-Slip Faulting in Eastern Tibet" name="eprints.title" />
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  38. <meta content="Porphyry copper, Strike-slip fault, Yulong, Himalayan, Tibet, China" name="eprints.keywords" />
  39. <meta content="The Yulong porphyry copper belt is the most significant porphyry copper belt in Tibet and is located in the
  40. Qiangtang terrane of the Himalayan-Tibetan orogen. The terrane is a collage of continental blocks joined by
  41. ophiolitic sutures and volcano-plutonic arc complexes. The Yulong belt is approximately 300 km long and 15 to
  42. 30 km wide, contains one giant, two large, and two medium- to small-sized porphyry copper deposits, and more
  43. than 20 mineralized porphyry bodies. The Yulong belt is located in the Changdu continental block that comprises
  44. Proterozoic to early Paleozoic crystalline folded basement and middle to late Paleozoic platform facies
  45. carbonate and clastic sedimentary rocks similar to the Yangtze continent. The porphyry belt is closely associated
  46. with Tertiary potassic volcanic rocks and alkali-rich intrusions in the area and controlled by north-south-north-northwest, large-scale, strike-slip faults, which are perpendicular to the collision zone between the
  47. Indian and Asian continents. Isotopic age determinations of the ore-bearing porphyries indicate that the magmatism
  48. occurred over at least three stages, peaking around 52, 41, and 33 Ma, respectively. The timing of middle
  49. and late shallow-level emplacement of these magmas is consistent with the ages of associated potassic volcanism
  50. and alkali-rich magmatism in the area. Although the porphyry deposits in the Yulong belt were
  51. developed in the intracontinental convergent environment, their mineralization styles and features are comparable
  52. to porphyry copper deposits in arc environments.
  53. Compared to ore-bearing calc-alkaline porphyries in island arcs or continental margin arcs, the porphyritic
  54. intrusions in the Yulong belt are characterized by high K2O contents and enrichment in Rb and Ba, suggesting
  55. a shoshonitic magmatic affinity. Strong negative anomalies for Nb, Ta, P, and Ti and positive anomalies for Rb,
  56. Ba, Th, and LREE, normalized by chondrite, are characteristic of arc magmas. These intrusions yield a narrow 143Nd/144Nd range varying from 0.51243 to 0.51253 and 87Sr/86Sr values from 0.7065 to 0.7077, which are transitional between type II enriched mantle and mid-ocean ridge basalt (MORB) values and closer to the former
  57. in terms of epsilon Nd- epsilon Sr. This suggests that the porphyritic magmas were derived either from a hydrous-enriched mantle metasomatized by components such as H2O, K, Rb, Ba, Th, and LREE or by melt derived from the
  58. subducted oceanic slab of the Paleozoic Jinshajiang oceanic plate. The hypothesis is supported by Pb isotope
  59. data for the intrusions.
  60. Large-scale strike-slip faults in eastern Tibet, which accommodated the compressive strains produced by the
  61. Asian-Indian continent collision, also localized the porphyry Cu mineralization. North to north-northeast-directed convergence and collision produced a dextral strike-slip fault system around 60 to 70 Ma. Northeast-directed wedging of the Indian continent and subsequent collision with the Yangtze continent during the Paleocene-
  62. Eocene produced conjugate strike-slip fault zones. The transition from a dextral strike-slip fault system
  63. to conjugate strike-slip zones resulted in stress relaxation and formation of strike-slip pull-apart basins. Crustalscale strike-slip faulting may have caused upwelling and partial melting of the hydrous-enriched mantle by decompression and facilitated the rise of a large volume of volatile-enriched porphyry magma that had ponded
  64. near the base of the lithosphere during this period." name="eprints.abstract" />
  65. <meta content="2003" name="eprints.date" />
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  67. <meta content="Economic Geology" name="eprints.publication" />
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  180. <meta content="Hou, Z. and Ma, H. and Zaw, K. and Zhang, Y. and Mingjie, W. and Zeng, W. and Guitang, P. and Renli, T. (2003) The Himalayan Yulong Porphyry Copper Belt: Product of Large-Scale Strike-Slip Faulting in Eastern Tibet. Economic Geology, 98 (1). pp. 125-145. ISSN 0361-0128" name="eprints.citation" />
  181. <meta content="http://eprints.utas.edu.au/1872/1/Zengqian%2C_Hongwen%2C_Zaw_et_al_ECON_GEOL_2003.pdf" name="eprints.document_url" />
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  183. <meta content="The Himalayan Yulong Porphyry Copper Belt:
  184. Product of Large-Scale Strike-Slip Faulting in Eastern Tibet" name="DC.title" />
  185. <meta content="Hou, Z." name="DC.creator" />
  186. <meta content="Ma, H." name="DC.creator" />
  187. <meta content="Zaw, K." name="DC.creator" />
  188. <meta content="Zhang, Y." name="DC.creator" />
  189. <meta content="Mingjie, W." name="DC.creator" />
  190. <meta content="Zeng, W." name="DC.creator" />
  191. <meta content="Guitang, P." name="DC.creator" />
  192. <meta content="Renli, T." name="DC.creator" />
  193. <meta content="260100 Geology" name="DC.subject" />
  194. <meta content="The Yulong porphyry copper belt is the most significant porphyry copper belt in Tibet and is located in the
  195. Qiangtang terrane of the Himalayan-Tibetan orogen. The terrane is a collage of continental blocks joined by
  196. ophiolitic sutures and volcano-plutonic arc complexes. The Yulong belt is approximately 300 km long and 15 to
  197. 30 km wide, contains one giant, two large, and two medium- to small-sized porphyry copper deposits, and more
  198. than 20 mineralized porphyry bodies. The Yulong belt is located in the Changdu continental block that comprises
  199. Proterozoic to early Paleozoic crystalline folded basement and middle to late Paleozoic platform facies
  200. carbonate and clastic sedimentary rocks similar to the Yangtze continent. The porphyry belt is closely associated
  201. with Tertiary potassic volcanic rocks and alkali-rich intrusions in the area and controlled by north-south-north-northwest, large-scale, strike-slip faults, which are perpendicular to the collision zone between the
  202. Indian and Asian continents. Isotopic age determinations of the ore-bearing porphyries indicate that the magmatism
  203. occurred over at least three stages, peaking around 52, 41, and 33 Ma, respectively. The timing of middle
  204. and late shallow-level emplacement of these magmas is consistent with the ages of associated potassic volcanism
  205. and alkali-rich magmatism in the area. Although the porphyry deposits in the Yulong belt were
  206. developed in the intracontinental convergent environment, their mineralization styles and features are comparable
  207. to porphyry copper deposits in arc environments.
  208. Compared to ore-bearing calc-alkaline porphyries in island arcs or continental margin arcs, the porphyritic
  209. intrusions in the Yulong belt are characterized by high K2O contents and enrichment in Rb and Ba, suggesting
  210. a shoshonitic magmatic affinity. Strong negative anomalies for Nb, Ta, P, and Ti and positive anomalies for Rb,
  211. Ba, Th, and LREE, normalized by chondrite, are characteristic of arc magmas. These intrusions yield a narrow 143Nd/144Nd range varying from 0.51243 to 0.51253 and 87Sr/86Sr values from 0.7065 to 0.7077, which are transitional between type II enriched mantle and mid-ocean ridge basalt (MORB) values and closer to the former
  212. in terms of epsilon Nd- epsilon Sr. This suggests that the porphyritic magmas were derived either from a hydrous-enriched mantle metasomatized by components such as H2O, K, Rb, Ba, Th, and LREE or by melt derived from the
  213. subducted oceanic slab of the Paleozoic Jinshajiang oceanic plate. The hypothesis is supported by Pb isotope
  214. data for the intrusions.
  215. Large-scale strike-slip faults in eastern Tibet, which accommodated the compressive strains produced by the
  216. Asian-Indian continent collision, also localized the porphyry Cu mineralization. North to north-northeast-directed convergence and collision produced a dextral strike-slip fault system around 60 to 70 Ma. Northeast-directed wedging of the Indian continent and subsequent collision with the Yangtze continent during the Paleocene-
  217. Eocene produced conjugate strike-slip fault zones. The transition from a dextral strike-slip fault system
  218. to conjugate strike-slip zones resulted in stress relaxation and formation of strike-slip pull-apart basins. Crustalscale strike-slip faulting may have caused upwelling and partial melting of the hydrous-enriched mantle by decompression and facilitated the rise of a large volume of volatile-enriched porphyry magma that had ponded
  219. near the base of the lithosphere during this period." name="DC.description" />
  220. <meta content="2003" name="DC.date" />
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  333.     <h1 class="ep_tm_pagetitle">The Himalayan Yulong Porphyry Copper Belt: Product of Large-Scale Strike-Slip Faulting in Eastern Tibet</h1>
  334.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Hou, Z.</span> and <span class="person_name">Ma, H.</span> and <span class="person_name">Zaw, K.</span> and <span class="person_name">Zhang, Y.</span> and <span class="person_name">Mingjie, W.</span> and <span class="person_name">Zeng, W.</span> and <span class="person_name">Guitang, P.</span> and <span class="person_name">Renli, T.</span> (2003) <xhtml:em>The Himalayan Yulong Porphyry Copper Belt: Product of Large-Scale Strike-Slip Faulting in Eastern Tibet.</xhtml:em> Economic Geology, 98 (1). pp. 125-145. 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/1872/1/Zengqian%2C_Hongwen%2C_Zaw_et_al_ECON_GEOL_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/1872/1/Zengqian%2C_Hongwen%2C_Zaw_et_al_ECON_GEOL_2003.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />2361Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2356" 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/10.2113/98.1.125">http://dx.doi.org/10.2113/98.1.125</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The Yulong porphyry copper belt is the most significant porphyry copper belt in Tibet and is located in the&#13;
  335. Qiangtang terrane of the Himalayan-Tibetan orogen. The terrane is a collage of continental blocks joined by&#13;
  336. ophiolitic sutures and volcano-plutonic arc complexes. The Yulong belt is approximately 300 km long and 15 to&#13;
  337. 30 km wide, contains one giant, two large, and two medium- to small-sized porphyry copper deposits, and more&#13;
  338. than 20 mineralized porphyry bodies. The Yulong belt is located in the Changdu continental block that comprises&#13;
  339. Proterozoic to early Paleozoic crystalline folded basement and middle to late Paleozoic platform facies&#13;
  340. carbonate and clastic sedimentary rocks similar to the Yangtze continent. The porphyry belt is closely associated&#13;
  341. with Tertiary potassic volcanic rocks and alkali-rich intrusions in the area and controlled by north-south-north-northwest, large-scale, strike-slip faults, which are perpendicular to the collision zone between the&#13;
  342. Indian and Asian continents. Isotopic age determinations of the ore-bearing porphyries indicate that the magmatism&#13;
  343. occurred over at least three stages, peaking around 52, 41, and 33 Ma, respectively. The timing of middle&#13;
  344. and late shallow-level emplacement of these magmas is consistent with the ages of associated potassic volcanism&#13;
  345. and alkali-rich magmatism in the area. Although the porphyry deposits in the Yulong belt were&#13;
  346. developed in the intracontinental convergent environment, their mineralization styles and features are comparable&#13;
  347. to porphyry copper deposits in arc environments.&#13;
  348. Compared to ore-bearing calc-alkaline porphyries in island arcs or continental margin arcs, the porphyritic&#13;
  349. intrusions in the Yulong belt are characterized by high K2O contents and enrichment in Rb and Ba, suggesting&#13;
  350. a shoshonitic magmatic affinity. Strong negative anomalies for Nb, Ta, P, and Ti and positive anomalies for Rb,&#13;
  351. Ba, Th, and LREE, normalized by chondrite, are characteristic of arc magmas. These intrusions yield a narrow 143Nd/144Nd range varying from 0.51243 to 0.51253 and 87Sr/86Sr values from 0.7065 to 0.7077, which are transitional between type II enriched mantle and mid-ocean ridge basalt (MORB) values and closer to the former&#13;
  352. in terms of epsilon Nd- epsilon Sr. This suggests that the porphyritic magmas were derived either from a hydrous-enriched mantle metasomatized by components such as H2O, K, Rb, Ba, Th, and LREE or by melt derived from the&#13;
  353. subducted oceanic slab of the Paleozoic Jinshajiang oceanic plate. The hypothesis is supported by Pb isotope&#13;
  354. data for the intrusions.&#13;
  355. Large-scale strike-slip faults in eastern Tibet, which accommodated the compressive strains produced by the&#13;
  356. Asian-Indian continent collision, also localized the porphyry Cu mineralization. North to north-northeast-directed convergence and collision produced a dextral strike-slip fault system around 60 to 70 Ma. Northeast-directed wedging of the Indian continent and subsequent collision with the Yangtze continent during the Paleocene-&#13;
  357. Eocene produced conjugate strike-slip fault zones. The transition from a dextral strike-slip fault system&#13;
  358. to conjugate strike-slip zones resulted in stress relaxation and formation of strike-slip pull-apart basins. Crustalscale strike-slip faulting may have caused upwelling and partial melting of the hydrous-enriched mantle by decompression and facilitated the rise of a large volume of volatile-enriched porphyry magma that had ponded&#13;
  359. near the base of the lithosphere during this period.</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">Porphyry copper, Strike-slip fault, Yulong, Himalayan, Tibet, 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">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1872</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">06 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">29 Jan 2008 20:21</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=1872;">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=1872">item control page</a></p>
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