本文關(guān)鍵詞： 硫同位素 騰沖-梁河錫礦帶 成礦流體 花崗巖　出處：《礦物學(xué)報(bào)》2017年06期 　論文類(lèi)型：期刊論文

【摘要】：滇西騰沖-梁河錫礦帶是三江特提斯成礦域重要的錫多金屬成礦區(qū),目前已發(fā)現(xiàn)具有代表性的大型錫礦床2個(gè):古近紀(jì)的梁河來(lái)利山錫礦床和晚白堊紀(jì)的騰沖小龍河錫礦床。對(duì)這2個(gè)礦床主成礦階段形成的黃鐵礦樣品進(jìn)行了硫同位素測(cè)定,結(jié)果表明來(lái)利山錫礦床黃鐵礦的δ~(34)SCDT值為+4.9‰~+6.7‰,平均值+5.5‰(n=10);小龍河錫礦床δ~(34)SCDT值為+5.0‰~+8.1‰,平均值+6.3‰(n=32)。兩個(gè)錫礦床的δ~(34)SCDT值與礦區(qū)花崗巖的δ~(34)SCDT值(0~+5.7‰)范圍基本一致,暗示這2個(gè)礦床的成礦流體中的硫均主要來(lái)自花崗巖漿。結(jié)合已有研究資料,認(rèn)為騰沖-梁河錫礦帶這兩個(gè)典型錫礦床與礦區(qū)花崗巖具有同時(shí)性,其成礦流體均主要源自各礦區(qū)花崗巖漿的分異演化,花崗巖漿還為錫礦化提供了部分Sn成礦物質(zhì),小龍河和來(lái)利山錫礦床的錫成礦作用與花崗巖漿活動(dòng)具有密切的聯(lián)系,屬于花崗巖巖漿熱液礦床。
[Abstract]:The Tengchong-Lianghe tin ore belt in western Yunnan is an important tin polymetallic metallogenic deposit in the Tethys metallogenic region of Sanjiang River. At present, two representative large tin deposits have been found:. The Lianghelishan tin deposit in Paleogene and the Xiaolonghe tin deposit in Tengchong in late Cretaceous. The pyrite samples formed in the main metallogenic stage of these two deposits were determined by sulfur isotopes. The results show that the SCDT of pyrite in Lailishan tin deposit is 4.9 鈥，

本文編號(hào)：1491506