接触交代夕卡岩型矿床中石榴子石和辉石成分特点及其与矿化的关系

本文对中国十四个接触交代钙夕卡岩矿床和钙-镁夕卡岩矿床中的三百多个样品的石榴子石和辉石成分进行了电子探针分析。不同矿床类型的石榴子石和辉石成分代表着钙夕卡岩矿床的十个矿种(Fe、Fe-Cu、Pb-Zn、W、Sn、Sn-Mo-Bi-W、、W-Bi-Cu-Mo、Cu-Zn、Cu-Sn、W-Zn-Cu)和钙-镁夕卡岩矿床的三个矿种(Fe-Cu、Mo、Pb-Zn)。石榴子石和辉石成分变化范围大,大多数石榴子石是含锰铝榴石+铁铝榴石+镁铝榴石小于15％(摩尔百分数)的钙铝榴石-钙铁榴石固溶体;大多数辉石是含小于5％的锰钙辉石的透辉石-钙铁辉石固溶体。有些Pb-Zn钙-镁夕卡岩矿床中的辉石显示出Mn含量有所增加。只有Sn和W钙夕卡岩矿床及Pb-Zn钙-镁夕卡岩矿床含(Sps+Alm+Pyr)总量大于15％的石榴子石。石榴子石和辉石成分与夕卡岩矿床金属矿化类型之间有某些联系。     

Skarn Mineral and Stable Isotopic Characteristics of Tonglushan Cu-Fe Deposit in Hubei Province

湖北大冶铜绿山铜铁矿床是长江中下游西段鄂东南矿集区一个大型夕卡岩矿床.围岩为三叠系大理岩及白云质大理岩,决定了其发育丰富的钙镁质复合夕卡岩矿物组合,包括石榴子石、辉石、角闪石、绿帘石、金云母、绿泥石等.本文详细描述了夕卡岩不同阶段矿物的特征,并对矿物进行了电子探针分析(EPMA)及碳、氧、硫稳定同位素研究.结果表明石榴子石形成于三期,成分上属于钙铝—钙铁系列,且从早到晚具有从钙铝向钙铁榴石演化趋势,反映出成矿溶液由酸性向碱性演化.环带结构的石榴子石和绿帘石从核部到边部Fe含量增高,说明磁铁矿是在Fe浓度升高的碱性溶液中沉淀.辉石为透辉石.角闪石属于单斜角闪石中的钙质角闪石,包括透闪石,韭闪石和少量阳起石.矿物成分分析表明辉石和石榴子石的Mn/Fe值与矿化金属元素存在一定的联系.相对于钙质夕卡岩,镁质或含镁质夕卡岩是铜铁矿体交代的更有利岩石.矿床硫化物的δ34 SV-CDT均为正值且变化范围较窄,介于0.6‰～3.8‰.成矿阶段方解石δ13CV-PDB变化于-2.9‰～6.3‰,δ18OV-SMOW变化于9.6‰ ～ 12.6‰,成矿后方解石的同位素值明显增大,δ13CV-PDB为-0.9‰ ～ 1.3‰,δ18OV-SMOW为15.2‰ ～ 17.3‰,趋向于围岩的同位素值.研究结果说明成矿阶段的硫和碳来自于深源或地幔,而成矿后期碳与地层发生明显的同位素交换反应.     

湖北大冶铜绿山铜铁矿床夕卡岩矿物学及碳氧硫同位素特征

湖北大冶铜绿山铜铁矿床是长江中下游西段鄂东南矿集区一个大型夕卡岩矿床。围岩为三叠系大理岩及白云质大理岩,决定了其发育丰富的钙镁质复合夕卡岩矿物组合,包括石榴子石、辉石、角闪石、绿帘石、金云母、绿泥石等。本文详细描述了夕卡岩不同阶段矿物的特征,并对矿物进行了电子探针分析(EPMA)及碳、氧、硫稳定同位素研究。结果表明石榴子石形成于三期,成分上属于钙铝—钙铁系列,且从早到晚具有从钙铝向钙铁榴石演化趋势,反映出成矿溶液由酸性向碱性演化。环带结构的石榴子石和绿帘石从核部到边部Fe含量增高,说明磁铁矿是在Fe浓度升高的碱性溶液中沉淀。辉石为透辉石。角闪石属于单斜角闪石中的钙质角闪石,包括透闪石,韭闪石和少量阳起石。矿物成分分析表明辉石和石榴子石的Mn/Fe值与矿化金属元素存在一定的联系。相对于钙质夕卡岩,镁质或含镁质夕卡岩是铜铁矿体交代的更有利岩石。矿床硫化物的δ34SV-CDT均为正值且变化范围较窄,介于0.6‰～3.8‰。成矿阶段方解石δ13CV-PDB变化于-2.9‰～6.3‰,δ18OV-SMOW变化于9.6‰～12.6‰,成矿后方解石的同位素值明显增大,δ13CV-PDB为-0.9‰～1.3‰,δ18OV-SMOW为15.2‰～17.3‰,趋向于围岩的同位素值。研究结果说明成矿阶段的硫和碳来自于深源或地幔,而成矿后期碳与地层发生明显的同位素交换反应。     

铜陵东狮子山铜矿床地质特征及成岩成矿机理研究

铜陵东狮子山铜矿为一夕卡岩矿床,但与常见的夕卡岩矿床明显不同。在产状方面,夕卡岩与围岩（大理岩）界线截然,围岩出现重结晶褪色边,夕卡岩边缘有淬火边,与夕卡岩相接触的辉石二长闪长岩出现烘烤褪色边,夕卡岩中出现辉石二长闪长岩角砾;在矿物组成上,具特殊的钾长石＋方解石＋石英囊状体,其内矿物边界规则,无分带现象,夕卡岩矿物无被交代现象;在结构构造方面出现特征的海绵陨铁结构、豆状构造、流动构造等;在地球化学方面,夕卡岩岩石的微量元素、稀土元素特征与辉石二长闪长岩相似,其中呈填隙状方解石的化学组成、同位素组成显示深源特征;夕卡岩矿物中出现熔融包裹体,均一温度高于９２０℃;矿体特征与寄主夕卡岩的各方面特征十分相似。这些特征显示该矿床可能是一种高温高密度粘稠的夕卡岩岩浆熔（流）体冷凝结晶演化过程的产物。     

陵东狮子山铜矿床地质特征及成岩成矿机理研究

铜陵东狮子山铜矿为一夕卡岩矿床,但与常见的夕卡岩矿床明显不同. 在产状方面,夕卡岩与围岩(大理岩)界线截然,围岩出现重结晶褪色边,夕卡岩边缘有淬火边,与夕卡岩相接触的辉石二长闪长岩出现烘烤褪色边,夕卡岩中出现辉石二长闪长岩角砾;在矿物组成上,具特殊的钾长石+方解石+石英囊状体,其内矿物边界规则,无分带现象,夕卡岩矿物无被交代现象;在结构构造方面出现特征的海绵陨铁结构、豆状构造、流动构造等;在地球化学方面,夕卡岩岩石的微量元素、稀土元素特征与辉石二长闪长岩相似,其中呈填隙状方解石的化学组成、同位素组成显示深源特征;夕卡岩矿物中出现熔融包裹体,均一温度高于920℃;矿体特征与寄主夕卡岩的各方面特征十分相似.这些特征显示该矿床可能是一种高温高密度粘稠的夕卡岩岩浆熔(流)体冷凝结晶演化过程的产物.     

岩浆夕卡岩的地质特征及其形成机理讨论──以铜陵地区为例

铜陵地区岩浆夕卡岩具有如下特征：（１）既可产于有碳酸盐岩的环境,也可赋存于远离碳酸盐岩的辉石二长闪长岩或角岩中;（２）产出形态复杂多样,可呈透镜状、脉状、小岩床、岩瘤和不规则岩枝状或角砾岩筒等等;（３）与围岩界线截然,在易交代的大理岩中也一样。作为其围岩的大理岩可见港湾状熔蚀边及重结晶褪色边,辉石二长闪长岩出现被烘烤褪色边,夕卡岩边缘部出现矿物呈等轴状三联晶嵌生淬火边;（４）夕卡岩常常与辉石二长闪长岩紧密伴生,构成了特殊的“夕卡岩－富碱侵入岩对”;（５）夕卡岩发育有海绵陨铁结构,豆状构造、流动构造和气孔构造;（６）微量元素、稀土元素的特征与相关的火成岩相似;（７）有熔融包裹体,均一温度高达１０００℃以上;（８）其矿物组成、化学成分与接触交代夕卡岩无明显差别。岩浆夕卡岩是深部中酸性硅酸盐岩浆演化过程中形成的夕卡岩浆冷凝结晶的产物。     

黑龙江省三矿沟夕卡岩型铁铜矿床矿物学特征及成矿物理化学条件

黑龙江三矿沟铁铜矿床位于大兴安岭北段多宝山矿集区,矿体产于燕山期侵入岩与奥陶系多宝山组大理岩接触带的夕卡岩内。根据矿物共生组合及交代关系,确定热液成矿过程包括夕卡岩阶段、退夕卡岩阶段和石英硫化物阶段。铁矿化主要发生在退夕卡岩阶段,形成磁铁矿、镜铁矿等铁氧化物,呈浸染状、条带状、块状产于钙铁榴石夕卡岩中。铜矿化主要发生在石英硫化物阶段,形成黄铜矿、斑铜矿等硫化物,交代早期矿物。电子探针分析等研究表明,三矿沟铁铜矿床发育钙质夕卡岩矿物组合,其石榴子石主要为钙铝榴石和钙铁榴石,辉石为透辉石钙铁辉石系列,角闪石属于钙角闪石系列,绿泥石属于I型三八面体富铁绿泥石。石榴子石有3种类型：早期自形粗粒的钙铝榴石(Grt-Ia)和钙铁榴石(Grt-Ib),以及晚期呈脉状产出的钙铁榴石(Grt-Ⅱ)。夕卡岩阶段成矿流体具有高温、弱酸性、高氧逸度的特征;退夕卡岩阶段流体温度降低,pH升高,形成大量铁氧化物;石英硫化物阶段流体温度和氧逸度降低,金属硫化物沉淀。     

广东尖山铁矿床中石榴石的标型特征和找矿意义

广东尖山铁矿床内发育了一个完整的钙铝榴石—钙铁榴石系列矿物,它们与矿化有着密切的关系,因此,研究石榴石的标型特征对探讨矿床形成条件是很重要的,对找矿也是有意义的。 一、石榴石的产出特征 尖山矿床赋存在尖山花岗岩体与中—上石炭统壶天群和下二叠统栖霞组碳酸盐岩层的接触带中。从花岗岩体向碳酸盐岩层形成了如下蚀变分带:绿帘石化花岗岩带→透辉石钾长石石英岩带→石榴石透辉石夕卡岩带→石榴石夕卡岩带→钙铁辉石夕卡岩带→大理岩带。钨钼矿化迭加在透辉石钾长石石英岩带中,铁矿化迭加在石榴石夕卡岩和钙铁辉石夕卡岩带中。     

河北矾山铁磷矿床含矿岩体韵律层结构的成因

呈岩盆状产出的矾山铁磷矿床含矿岩体,属层状超镁铁岩系列,其中各岩相带均为层状结构,而且辉石岩带和黑云辉石岩带又大致以剖面中心的伟晶正长黑云辉石岩为对称构成有规律的韵律层。本文讨论了韵律层结构的成因,认为韵律层实际上是按一定间隔形成黑云辉石岩造成的。黑云辉石岩是在岩浆结晶过程中的残余流体交代先成辉石岩的产物。文中按黑云母内的铁镁比值计算了此交代反应的计量系数,由实测地质数据按质量守恒方程得到了在各岩相带两相邻界面上的交代流体中SiO_2和CaO的含量差。由于此含量差的有规律变化,使交代作用间歇进行,因而有规律地出现黑云辉石岩,于是造成韵律层结构。     

柿竹园夕卡岩中钙铝-钙铁榴石系列石榴子石形成条件的实验研究

柿竹园夕卡岩中有早、晚形成的两种产状石榴子石。本文为查明其形成物理化学条件及与矿化的关系,采用矿区天然花岗岩、灰岩和夕卡岩化早期形成的石榴子石为试样进行了模拟实验研究。实验结果表明:夕卡岩化早期石榴子石是在温度400—750℃,压力500—1000bar,pH=5—8条件下,由富含Si、Al、Fe、Cl、F等组分的热液与上泥盆统佘田桥组灰岩交代反应形成的;晚期石榴子石是在温度250—700℃,压力500—1000bar,pH=5—14条件下,由富含Si、Al、F等组分的带钨溶液与早期石榴子石交代反应产生重结晶作用形成的。     

Alteration,mineralization, and genesis of the zoned Tongshan skarn-type copper deposit,Anhui, China

The Tongshan skarn-type copper deposit is located in the Anqing–Guichi ore cluster of the iron–copper metallogenic belt which occurs along the Middle–Lower Yangtze River Valley, China. In the study area, skarnization and mineralization took place along the contact zone between carbonates and granodiorite porphyries. The contact zone shows significant horizontal and vertical variations in alteration and mineralization. In the horizontal direction, the garnet content is high in the skarns near the intrusive body (proximal skarns), the diopside content is high farther from the intrusive body (distal skarns), and hedenbergite is concentrated in the skarns adjacent to the marble zone. Limestones located far from the marble zone experienced a strong silicification. In the vertical direction (from higher to lower levels), the rocks change from hornfels to calcareous skarn to magnesian skarn. Mineralogical studies show that the skarns near the intrusion are relatively oxidized, and the garnet in the skarns is relatively andradite rich. High concentrations of Cu are found in the porphyries with quartz veins, as well as in the calcic skarns, magnesian skarns, hornfelses, and marbles, which are located at distances of 13, 10, 43 and 25 m from the porphyries, respectively. High concentrations of Zn are found in silicified limestones and skarns located even farther from the porphyries. The present findings suggest that the Tongshan deposit was subjected to prograde alteration and mineralization, followed by retrogression. The alteration can be divided into a sequence of stages: contact metamorphism, prograde metasomatism, early retrogression, and late retrogression. The copper mineralization occurred mainly during the early retrogression, and the copper was further enriched in quartz veins within the porphyries during the late stages of magma evolution.     

青海西部祁漫塔格地区矽卡岩铁铜多金属矿床的矽卡岩类型和矿物学特征

青海西部祁漫塔格地区矽卡岩型铁铜多金属矿床分布广泛,主要发育两类矽卡岩,即钙矽卡岩和锰质矽卡岩,少数矿区还有镁矽卡岩.钙矽卡岩的组成矿物主要有透辉石、钙铁辉石、钙铝-钙铁系列石榴石、绿帘石、阳起石和方柱石,常伴随Fe、Cu、Mo矿化,构成钙矽卡岩型铁多金属矿床或铜(钼)矿床,而锰质矽卡岩主要由锰钙铁辉石组成,含少量锰三...     

环太平洋地区的矽卡岩矿床

环太平洋地区是世界上最重要的巨型矽卡岩矿床成矿带。在地跨亚、美、澳三大洲二十多个沿岸国家中,共分布有一千多个不同类型的矽卡岩矿床。按含矿矽卡岩主要金属元素的不同,可把本区矽卡岩矿床划分为铁、铜、铅-锌、钨、锡、钼、金七类。文中对各类矽卡岩矿床的分布和主要地质特征作了概括介绍。按含矿矽卡岩矿物组合的不同,又可分为镁矽卡岩型、钙矽卡岩型、锰质矽卡岩型和碱质矽卡岩型四类。太平洋东西两岸的矽卡岩矿床有许多共同点,但在矿化强度、分布规律和成矿时代等方面又有一定差异。文中还论述了本区矽卡岩矿床的成矿系列和岩浆岩成矿金属性问题。     

In-situ LA–ICP-MS trace elemental analyses of magnetite: The Mesozoic Tengtie skarn Fe deposit in the Nanling Range,South China

The Nanling Range in South China hosts numerous world-class W–Sn deposits and some Fe deposits. The Mesozoic Tengtie Fe skarn deposit in the southern Nanling Range is contemporaneous with the regional Sn mineralization. The deposit is composed of numerous ore bodies along the contacts between the late Paleozoic or Mesozoic carbonate rocks and the Yanshanian Lianyang granitic complex. Interaction of the magma with hosting dolomitic limestone and limestone formed calcic (Ca-rich) and magnesian (Mg-rich) skarns, respectively. The Tengtie deposit has a paragenetic sequence of the prograde stage of anhydrous skarn minerals, followed by the retrograde stage of hydrous skarn minerals, and the final sulfide stage. Magnetite in the prograde and retrograde skarn stages is associated with diopside, garnet, chlorite, epidote, and phlogopite, whereas magnetite of the final stage is associated with chalcopyrite and pyrite. Massive magnetite ores crosscut by quartz and calcite veins are present mainly in the retrograde skarn stage. Laser ablation ICP-MS was used to determine trace elements of magnetite from different stages. Some magnetite grains have unusually high Ca, Na, K, and Si, possibly due to the presence of silicate mineral inclusions. Magnetite of the prograde stage has the highest Co contents, but that of the sulfide stage is extremely poor in Co which partitions in sulfides. Magnetite of magnesian skarns contains more Mg, Mn, and Al than that of calcic skarns, attributed to the interaction of the magma with compositionally different host rocks. Magnetite from calcic and magnesian skarns contains 6–185 ppm Sn and 61–1246 ppm Sn, respectively. The high Sn contents are not due to the presence of cassiterite inclusions which are not identified in magnetite. Instead, we believe that Sn resides in the magnetite structure. Regionally, intensive Mesozoic Sn mineralization in South China indicates that concurrent magmatic–hydrothermal fluids may be rich in Sn and contribute to the formation of high-Sn magnetite. Our study demonstrates that trace elements of magnetite can be a sensitive indicator for the skarn stages and wall-rock compositions, and as such, trace elemental chemistry of magnetite can be a potentially powerful fingerprint for sediment provenance and regional mineralization.     

Geology of gold-bearing skarn deposits in the middle and lower Yangtze River Valley and adjacent regions

The middle and lower Yangtze River Valley and adjacent regions are the most important metallogenic belt of gold (and copper)-bearing skarn deposits in China. The total gold reserves in this belt have been estimated at more than 600 t. The gold-bearing skarns are mainly distributed in the southeastern Hubei, Tongling and northern Anhui regions. Favorable tectonic settings are depressions and fold zones of the platforms, i.e., mobile belts. These skarns are hosted by platformal limestone, dolomitic limestone and dolomite of the Triassic, Carboniferous-Permian and Middle to Lower Cambrian formations. The related intrusions are Yenshanian (180 to 113 Ma) calc-alkaline quartz monzodiorite, granodiorite, quartz monzonite, monzogabbro, and their hybabyssal facies. The intrusions have high Fe₂O₃/FeO (>0.5) and intermediate initial ⁸⁷Sr/⁸⁶Sr ratios (0.7046 to 0.7087). Their REE distribution patterns are LREE-enriched and exhibit smooth, right-dipping curves. These suggest that the source materials mainly came from upper mantle, with contamination by sialic crustal components. The auriferous skarns are both calcic and magnesian, but calcic skarns are most common. The constituent minerals of the calcic skarns are diopside, garnet, wollastonite, vesuvianite and scapolite, whereas magnesian skarns are dominated by forsterite, spinel, diopside, phlogopite, chondrodite and clinohumite, with abundant superimposed serpentine, clinochlore and brucite. The compositions of coexisting pyroxenes and garnets are diopside and andradite, indicating the high oxygen fugacity and low acidity conditions. Gold is closely associated with Cu (Pb, Zn) sulfides and exists mainly in the form of native gold and electrum. Arsenides, tellurides, bismuthides and selenides are present in many ore deposits. Therefore, Cu, As, Bi, Te, Ag, Pb, Zn, Se and Co are the major metals present in the deposits and are important geochemical ore-searching indicators. In some Au (Fe, Cu) magnesian skarns, magnesiomagnetite, magnesioferrite and ludwigite are locally abundant. The metasomatic zoning in many gold skarn deposits is very distinct consisting of an outward sequence of: Fe (Cu)→Cu (Mo)→Cu (Au)→Au (Cu)→Au (Pb, Zn). The geologic characteristics of Au (Cu) skarn deposits that formed in the mobile platformal setting of China have distinct differences compared to Au skarns formed in orogenic belts at convergent plate margins in British Columbia and the western USA.     

Pb-Zn-Ag-bearing M anganoan Skarns of China

Manganoan skarns consist of special Mn (Ca, Mg, Fe, Al) silicate metasomatic minerals and are usually associated with Pb-Zn(Ag) mineralization. They occur chiefly along the lithologic contacts or faults and fractures of carbonate wall rocks distal from the intrusive contact zone, and are combined with Fe, Cu, W, Sn and Cu-bearing calcic or magnesian skarns occurring in the contact zones to constitute certain metasomatic zoning. Manganoan skarns are formed later than calcic or magnesian skarns. Their rock-forming temperatures are lower than those of calcic or magnesian skarns. The mineral assemblages of manganoan skarns occurring in different carbonate rocks (limestone or dolomite) are notably different.     

青海西部祁漫塔格地区主要矽卡岩铁多金属矿床成矿地质背景和矿化蚀变特征

青海西部祁漫塔格地区矽卡岩铁多金属矿床分布广泛,目前已成为中国西部最重要和最有找矿潜力的矽卡岩铁多金属成矿带.在大地构造上,该地区属东昆仑造山带;成矿主要与印支期(204～237Ma)闪长岩、花岗闪长岩和二长花岗岩有关;控矿地层包括蓟县系狼牙山组大理岩、硅质岩,奥陶系-志留系滩间山群大理岩、碎屑岩、硅质岩、中-基性火山岩和石炭系结晶灰岩、碎屑岩等.区内发育3类矽卡岩,即钙矽卡岩、镁矽卡岩和锰质矽卡岩,以前者为主.钙矽卡岩常伴生Fe、Cu、Mo(Pb,Zn)矿化,镁矽卡岩主要伴生Fe矿化,锰质矽卡岩则伴生Pb、Zn(Ag)矿化;矿石矿物组合多种多样,矿化具有一定的分带性.内接触带侵入岩广泛发育钾长石化,与矽卡岩类型一起构成该类矿床的重要找矿标志之一.     

安徽贵池铜山矽卡岩型铜矿床蚀变矿化分带特征及其成因

铜山矽卡岩型铜矿床产于长江中下游铁铜成矿带中的安庆—贵池矿集区。研究区矽卡岩化与矿化发生于碳酸盐岩地层与花岗闪长斑岩间的接触带中,蚀变及矿化具有水平与垂向分带特征。水平方向上,靠近岩体的矽卡岩中石榴子石含量较高,远离岩体的矽卡岩中透辉石含量较高;靠近大理岩带发育钙铁辉石矽卡岩,远离大理岩带的灰岩硅化较强。垂向上,从上到下依次为角岩带、钙质矽卡岩带和镁质矽卡岩带。矿物成分研究表明,靠近岩体处氧化性较强,石榴子石的钙铁榴石端员含量高;铜多富集于含石英脉的岩体、距岩体略远的矽卡岩、角岩或大理岩中,而锌多富集于硅化灰岩及远离岩体的矽卡岩中。研究表明,该矿床中蚀变矿化经历了进变期和退变期,包括接触热变质阶段、进化交代阶段和早退化蚀变阶段、晚退化蚀变阶段。其中,大规模的黄铜矿化主要发生于早退化蚀变阶段,且在岩浆演化晚期进一步富集于斑岩石英脉中。     

中国夕卡岩矿床中的角闪石

文章综合分析研究了中国21个夕卡岩矿床中的130个角闪石的成分分析数据。根据夕卡岩类型及其伴生金属矿化的不同，把角闪石分为4大类：钙夕卡岩中的角闪石多属钙角闪石，包括绿钙闪石、铁角闪石、镁绿钙闪石、铁浅闪石、阳起石、铁阳起石、铁镁钙闪石和铁韭闪石等；镁夕卡岩中的角闪石以透闪石为主，局部有浅闪石或韭闪石；锰质夕卡岩中的角闪石有锰质阳起石、锰质透闪石、锰直闪石和锰镁闪石；碱质夕卡岩中的角闪石属钠-钙角闪石或钠角闪石类，包括钠透闪石、镁亚铁钠闪石、亚铁钠闪石、镁铝钠闪石和镁钠闪石。碳酸盐围岩和有关侵入岩的成分对角闪石的类型、成分及其伴生金属矿化起重要的作用。     

我国夕卡岩矿床中的辉石和似辉石特征及其与金属矿化的关系

根据我国３７个夕卡岩矿床中辉石和似辉石的成分和共生矿物特征等的综合研究分析，指出不同金属矿化夕卡岩中的辉石、似辉石类型和成分特征各不相同，因而作为鉴别夕卡岩含矿性的翻来覆去矿的地球化学标志，岩浆期镁夕卡岩中的辉石为铝透辉石，可伴生磁铁矿化；岩浆期后镁夕卡岩中的为较纯的透辉石，可能伴生Ｆｅ、Ｃｕ、Ｍｏ、Ｓｎ、Ａｕ等矿化；钙夕卡岩中的辉石主要为透辉石，而似辉石成分多为硅灰石，随着辉石中钙铁辉石和钙鳃辉