第6期 毛景文等地幔流体参与胶东金矿成矿作用的氢氧碳硫同位素证据 857 China M ineralium Deposita, 38: 14r 153 (supp ) h6(in Chinese hang Zhenhai, Zhang J ngx in and Ye Suzhi 1993 The study and Zheng Yongfei, Chen J iangfeng 2000 Geochem istry of Stable testing of Rb-Sr isochron age in Zhao ai gold m etallbogenetic so tope Beijing: Science Press(n Ch inese) alterat on zone in J iaodong distrit Noble M etal Geo bgy, 2 Zhou T H, Goldfarb R J, Phillps G N. 2002 Tectonics and (1): 26- 34(in Chinese w ith English abstr distributon of go ld deposits in China an overview. M neralim Zhang Zhuru, Chen Shien 1999. Superlarge gold deposit Deposita, 37: 249- 282 exp bratin perspective n J iao lai Basin of J iaodong gold Zhou Xinhua, Yang J inhui, Zhang L anchang 2003 M etallogenesis m etalbgenetic dom a in Geoch m ca, 28(3): 203- 212(in f superlarge gold deposits in J odong regon and deep Chinese w ith English abstract) processes of suboont nental lithosphere beneath North China ao L unshan, et al. 1993 Prelm inary study on the relationsh p Craton in Mesozoic Scence in China(Series D), 46(supp m ineralzaton in J iaodong district Modern Geo bgy, 7 The re la tion sh ip be tween m an tle-der ied fluid and gold ore-foma t ion in the eastern Shandong Pen in sula: Ev idences from D-O-C-S Iso topes MAO Jingwen,2),L I Houm in", WANG Yitian", ZHAN G Changqing"),WANG Ruiting 1)Institute of M ineral Resources, Chinese A cadeny f Geolog ical S ciences, B eij ing, 100037 2)Faculry d earth Sciences and M ineral Resources, China U niversity of Geosciences, B eij ing, 100083 A bstract C There are three types of go ld depo sits in the Eastern Shandong pen in sula, the largest go ld area in China, i e quartz vein, fracture altered and brecc ia types The fo mer two deve loped along a group of NE-trend ing faults and are hosted by Jurassic biotite gran ite intrusions dated 160 150 M a, Precam brian m orphic rocks and C retaceous grand orite dated 130- 126 M a on the Precam brian cry stalline basement A nd the late one occurs around the northern m arg in of the j iao jia aizhou Crtaceous basin and the m ineralizat ion is contro lled by bo th the de tachem ent fractures andn e-trend ng faults In this study we cho se 89 sam p les from ten go ld depo sits com prising the L inglong, J iao jia, San shandao, Cangshang Wang ershan, Day igezhuang, Denggezhuang, Pengjiakuang, Fayunkuang and Dazhuangzi the L ing long jurassic bitite granite, Guo jialing Cretaceous granodiorite, and a rchaean gneiss for the sy stem ati m easurem ents of s, D,O and c stab le iso to tpes The analy ses results of these iso topes reflect the three types go ld depo sits occur in different modes but depo sit in by the sam e m ix tured flu id sy stem derived from m antle flu id reserv ir inco rpo rated w ith crust flu ids by the strong in teraction w ith the ho st rocks at 120 M a their ore-fo m ing age is later than bo th the jurassic biotite gran ite and Cretaceous grando tite, and over lap s w ith the age of d iabase and lam p rop hy re dikes rang ing from 12 IM a to 114 a the hydro them al flu ids w hich is respon sib le to bo th go ld m ineralizatin and the retro grade alteration of the diabase and lamp rop hy re dikes is quite sm ilar, belong ing to CO 2 and po tash-enriched flu id sy stem, w hich is possibly the con sequence of the C retaceous litho spheric th inn ing and astheno sp here upw elling p rocess in Eastern China Key words CDO iso topes, m antle flu, go ld deposits, Eastern Shandong pen insu la 中国南方百色盆地浅层生物气组成与成因 朱扬明),翁焕新),邹华耀2),蔡勋育3,黄绍甫3,罗毅 1)浙江大学地球科学系,杭州,3100272)石油大学资源与信息学院,北京,102249 3)中石化南方分公司研究院,昆明,650200 本文根据30余个气样分析资料,结合地质、地球化学背景,对百色第三系 可划分为3种成因类型:纯生物气、生物气-热成因气混合气和原 戊留型盆地浅层生物气的组成和分布特征进行了深入研究,并 们在时空上呈规律性分布,与邻近烃源岩的演化程度及降解油臧 形成机制。这些浅层气主要以烃类气体为主,一般占90%以 百岗组和那读组烃源岩在早期埋藏和后期盆地拍升过程中可能经 量有较大变化范围,分别主要在50%-100%和0-50%之间 作用。本文对这些浅层气臧提出了多气源晚期成藏模式,解释了 混入生物气的比例。所研究浅层气的一个重要特征是其碳同位 然气化学和碳同位素组成的变化规律。 8值主要变化在55%75‰范围。按照分子和碳同位素组成及轻烃参数 201994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net
Ch ina. M ineralium D epo sita, 38: 141～ 153. Zhang Zhenhai, Zhang J ingxin and Ye Suzh i. 1993. T he study and testing of Rb2Sr isoch ron age in Zhao2L ai go ld m etallogenetic alteration zone in J iaodong district. N oble M etal Geo logy, 2 (1): 26～ 34 (in Ch inese w ith English abstract). Zhang Zhuru, Chen Sh izhen. 1999. Superlarge go ld depo sit exp lo ration perspective in J iao lai Basin of J iaodong go ld m etallogenetic dom ain. Geoch im ica, 28 ( 3 ): 203～ 212 ( in Ch inese w ith English abstract). Zhao L unshan, et al. . 1993. P relim inary study on the relationsh ip betw een the tectonc evo lution of the crust and go ld m ineralization in J iaodong district. M odern Geo logy, 7 (supp. ): 1～ 6 (in Ch inese). Zheng Yongfei, Chen J iangfeng. 2000. Geochem istry of Stable Iso tope. Beijing: Science P ress (in Ch inese). Zhou T H , Go ldfarb R J, Ph illip s G N. 2002. T ectonics and distribution of go ld depo sits in Ch ina: an overview. M ineralium D epo sita, 37: 249～ 282. Zhou X inhua, Yang J inhui, Zhang L ianchang. 2003. M etallogenesis of superlarge go ld depo sits in J iaodong region and deep p rocesses of subcontinental litho sphere beneath N o rth Ch ina C raton in M esozo ic. Science in Ch ina (Series D ) , 46 (supp. ): 14～ 25. The Rela tion sh ip between M an tle-der ived Fluid and Gold Ore-forma tion in the Ea stern Shandong Pen in sula: Ev idences from D -O-C-S Isotopes M AO J ingw en1, 2) , L I Houm in1) , W AN G Y itian1) , ZHAN G Changqing2) , W AN G R u iting2) 1) Institu te of M ineral R esou rces, Ch inese A cad em y of Geolog ical S ciences,B eij ing , 100037 2) F acu lty of E arth S ciences and M ineral R esou rces, Ch ina U niversity of Geosciences, B eij ing , 100083 Abstract T here are th ree types of go ld depo sits in the Eastern Shandong pen in su la, the largest go ld area in Ch ina, i. e. quartz vein, fractu re altered and b reccia types. T he fo rm er tw o developed along a group of N E2trending fau lts and are ho sted by Ju rassic b io tite gran ite in tru sion s dated 160～ 150 M a, P recam b rian m etam o rph ic rock s and C retaceou s granodio rite dated 130～ 126 M a on the P recam b rian crystalline basem en t. A nd the late one occu rs around the no rthern m argin of the J iao jia—L aizhou C rtaceou s basin and the m ineralization is con tro lled by bo th the detachem en t fractu res and N E2trending fau lts. In th is study w e cho se 89 sam p les from ten go ld depo sits com p rising the L inglong, J iao jia, San shandao, Cangshang, W angθershan, D ayigezhuang, D enggezhuang, Pengjiakuang, Fayunkuang and D azhuangzi; the L inglong Ju rassic b io tite gran ite, Guo jialing C retacceou s granodio rite, and A rchaean gneiss fo r the system atic m easu rem en ts of S, D , O and C stab le iso to tpes. T he analyses resu lts of these iso topes reflect the th ree types go ld depo sits occu r in differen t m odes bu t depo sition by the sam e m ix tu red flu id system derived from m an tle flu id reservio r inco rpo rated w ith cru st flu ids by the strong in teraction w ith the ho st rock s at 120 M a. T heir o re2fo rm ing age is later than bo th the Ju rassic b io tite gran ite and C retaceou s granodio tite, and overlap s w ith the age of diabase and lam p rophyre dikes ranging from 121M a to 114M a. T he hydro therm al flu ids w h ich is respon sib le to bo th go ld m ineralization and the retrograde alteration of the diabase and lam p rophyre dikes is qu ite sim ilar, belonging to CO 2 and po tash2en riched flu id system , w h ich is po ssib ly the con sequence of the C retaceou s litho spheric th inn ing and astheno sphere upw elling p rocess in Eastern Ch ina. Key words: C2D 2O iso topes; m an tle flu ids; go ld depo sits; Eastern Shandong pen in su la ～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～ 中国南方百色盆地浅层生物气组成与成因 朱扬明1) , 翁焕新1) , 邹华耀2) , 蔡勋育3) , 黄绍甫3) , 罗毅3) 1) 浙江大学地球科学系, 杭州, 310027; 2) 石油大学资源与信息学院, 北京, 102249 3) 中石化南方分公司研究院, 昆明, 650200 本文根据30 余个气样分析资料, 结合地质、地球化学背景, 对百色第三系 残留型盆地浅层生物气的组成和分布特征进行了深入研究, 并探讨了其成因和 形成机制。这些浅层气主要以烃类气体为主, 一般占90% 以上。甲烷和烷烃含 量有较大变化范围, 分别主要在50%～ 100% 和0～ 50% 之间, 取决于热成因气 混入生物气的比例。所研究浅层气的一个重要特征是其碳同位素很轻, 甲烷的 ∆13C值主要变化在55‰～ - 75‰范围。按照分子和碳同位素组成及轻烃参数, 该盆地浅层气可划分为3 种成因类型: 纯生物气、生物气2热成因气混合气和原 油菌解气。它们在时空上呈规律性分布, 与邻近烃源岩的演化程度及降解油藏 的分布有关。百岗组和那读组烃源岩在早期埋藏和后期盆地抬升过程中可能经 历过两次成气作用。本文对这些浅层气藏提出了多气源晚期成藏模式, 解释了 地层剖面上天然气化学和碳同位素组成的变化规律。 第 6 期 毛景文等: 地幔流体参与胶东金矿成矿作用的氢氧碳硫同位素证据 758