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据新疆萨热克铜矿区内绿泥石化蚀变相的产状可划分为A型、B型、C型和D型4期。采用绿泥石矿物温度计和地球化学岩相学研究,认为4种绿泥石蚀变相为陆内红层盆地中紫红色铁质碎屑岩系发生褪色化蚀变机制之一。A型和B型绿泥石相为中-晚侏罗世—早白垩世构造-热事件所形成,A型自生粒间状绿泥石在侏罗系-下白垩统中总体顺层分布,形成温度在163~217℃,与辉铜矿共生且形成于埋藏-压实成岩期,热流密度为40.39~48.43 Jm-2s-1,热通量较小。B型微细脉型绿泥石化蚀变相形成于盆地流体改造期,总体沿切层裂隙和显微裂隙分布,与辉铜矿和斑铜矿等共生,形成温度为188~219℃,热流密度较大,在116.90~330.49 Jm-2s-1。斑铜矿+辉铜矿型(196~237℃)和斑铜矿型(203~226℃)铜矿石带指示了盆地流体改造富集成矿的中心部位,热流密度在330.49~878.78 Jm-2s-1,其热流密度明显较大。B型绿泥石相与碎裂岩化相和沥青化蚀变相具有多重耦合结构,形成温度越高,裂隙渗透率越高,可达30×10-6 cm2/211~227℃,推测存在热启裂隙作用。C型和D型绿泥石相为构造-岩浆-热事件所形成,C型团斑状-细脉状绿泥石化蚀变相分布在辉绿辉长岩脉群边部和外接触带含铜漂白-褪色化蚀变带中,含铜蚀变辉绿岩发生绿泥石化相蚀变温度为平均为175℃,平均热流密度321.46 Jm-2s-1,在克孜勒苏群褪色化杂砾岩中其绿泥石形成温度较高(236~238℃),热流密度高达442.86~922.63 Jm-2s-1;而D型绿泥石化蚀变相分布在碎裂岩化蚀变辉绿辉长岩脉群中,揭示遭受构造热事件的古地温在121~185℃,平均热流密度为239.59 Jm-2s-1。四种类型绿泥石蚀变相揭示萨热克铜矿区经历了异常古地场演化和古热事件。
According to the occurrence of chlorite alteration in the Sagrek copper deposit in Xinjiang, it can be divided into four types: A type, B type, C type and D type. Based on the chlorite mineral thermometer and geochemical petrography, it is considered that the four chlorite alteration facies are one of the mechanisms of fading of mafic iron clastic rocks in terrestrial red beds. Type A and Type B chlorites are formed in the Meso-Late Jurassic-Early Cretaceous tectono-thermal events. Type A autogenous granular chlorite distributes generally along the Jurassic-Lower Cretaceous, The formation temperature ranged from 163 ℃ to 217 ℃. It was coexisted with chalcocite and formed during burial-compaction diagenesis. The heat flux was between 40.39 and 48.43 Jm-2s-1, and the heat flux was small. The B-type veinlet-type chlorite altered facies was formed in the basin fluid transformation period, along the distribution of fissure and micro-fractures along with the distribution of chalcopyrite and beryllite. The formation temperature was 188-219 ℃ and the heat flux Larger, at 116.90 ~ 330.49 Jm-2s-1. The burial zones of porphyry + chalcocite (196 ~ 237 ℃) and buritite (203 ~ 226 ℃) copper ore belts indicate that the central part of the basin fluids is enriched for mineralization and the heat flux density is between 330.49 and 878.78 Jm-2s -1, its heat flux density is obviously larger. Type B chlorite has multiple coupling structures with fractured and altered facies. The higher the formation temperature is, the higher the fracture permeability is, reaching 30 × 10-6 cm2 / 211 ~ 227 ℃, which is presumed to exist Hot start cracking role. C-type and D-type chlorite facies formed by the tectono-magmatic events, and C-type porphyritic-vein veined chlorite alteration facies distributes on the edge of the gabbro diabase cluster and the outer contact zone contains copper In the bleaching-fading alteration zone, the temperature of chlorite alteration diabase is 175 ℃ and the average heat flux is 321.46 Jm-2s-1. In the kizilsu flocks, Its chlorite formation temperature is high (236 ~ 238 ℃) and its heat flux is as high as 442.86 ~ 922.63 Jm-2s-1. The type D chlorite alteration facies distributes in the lithology In the veins, the paleotemperature was revealed to be 121 ~ 185 ℃ with an average heat flux of 239.59 Jm-2s-1. The four types of chlorite altered facies reveal that the Sagrek copper deposit area has undergone anomalous paleoenvironment evolution and paleo-thermal events.