Ophicalcites exposed on the island of Tinos, Greece, occur as ellipsoidal bodies within greenschist-facies phyllites of the Upper Cycladic Unit. Close to their outcrops, blocks of serpentinites, metabasic rocks and metasediments were identified, implying a tectonically dismembered ophiolitic sequence in the study area. The ophicalcites comprise brecciated serpentinites cemented by calcite. Based on textural, mineralogical and deformation features, five ophicalcite varieties were discriminated, reflecting calcite precipitation, sedimentary features and increasing brecciation. Serpentinitic fragments comprise antigorite, while Cr-spinel, magnetite, talc and chlorite are accessory minerals. Carbonate veins consist of calcite and minor dolomite, talc, chlorite, and rarely epidote. Bulk rock chemical compositions and Cr-spinel mineral composition point towards a supra-subduction environment. Carbon and oxygen isotope ratios of calcite imply precipitation from mixed marine and hydrothermal fluids, followed by isotope exchange due to late, greenschist-facies overprint. The Tinos ophicalcites record intraoceanic exhumation of the ultramafics at the seafloor, where faulting and serpentinization caused an extensive network of fractures, healed by carbonates. Such intraoceanic deformation can be attributed either to obduction tectonics expressed by thrusting of oceanic piles, or to transpressional(?) transform faults, or more probably to slip along detachment fault of an oceanic core complex.

在希腊蒂诺斯岛上裸露的蛇纹石以椭圆体形式出现在上克拉克拉多单元上的绿片岩相橄榄岩中。在它们的露头附近，发现了蛇纹岩块，后生岩和沉积物，这表明该研究区的构造被肢解的蛇纹岩序列。ophicalcites包括由方解石胶结的角砾状蛇纹岩。根据质地，矿物学和变形特征，区分了5种蛇绿岩，反映了方解石的沉淀，沉积特征和增加的角砾化。蛇纹岩碎片包括蛇纹石，而Cr-尖晶石，磁铁矿，滑石和亚氯酸盐是辅助矿物。碳酸盐岩脉由方解石和次要白云石，滑石，绿泥石和极少的附子组成。块状岩石化学成分和Cr-尖晶石矿物成分指向超俯冲环境。方解石的碳和氧同位素比暗示着混合的海洋和热液中的沉淀，随后由于较晚的绿片岩相叠印而进行了同位素交换。Tinos ophicalcites记录了海底超镁铁质的洋中发掘，那里的断层和蛇纹石化导致了广泛的裂缝网络，并被碳酸盐治愈。这样的洋内变形既可以归因于洋洋洋洋冲动所表达的俯冲构造，也可以归因于超压（？）转换断裂，或者更可能是沿着洋心复合体的脱离断裂滑移。方解石的碳和氧同位素比暗示着混合的海洋和热液中的沉淀，随后由于较晚的绿片岩相叠印而进行了同位素交换。Tinos ophicalcites记录了海底超镁铁质的洋中发掘，那里的断层和蛇纹石化导致了广泛的裂缝网络，并被碳酸盐治愈。这样的洋内变形既可以归因于洋洋洋洋冲动所表达的俯冲构造，也可以归因于超压（？）转换断裂，或者更可能是沿着洋心复合体的脱离断裂滑移。方解石的碳和氧同位素比暗示着混合的海洋和热液流体中的沉淀，然后由于较晚的绿片岩相叠印而进行了同位素交换。Tinos ophicalcites记录了海底超镁铁质的洋中发掘，那里的断层和蛇纹石化导致了广泛的裂缝网络，并被碳酸盐治愈。这样的洋内变形既可以归因于洋洋洋洋冲动所表达的俯冲构造，也可以归因于超压（？）转换断裂，或者更可能是沿着洋心复合体的脱离断裂滑移。由碳酸盐治愈。这样的洋内变形既可以归因于洋洋洋洋冲动所表达的俯冲构造，也可以归因于超压（？）转换断裂，或者更可能是沿着洋心复合体的脱离断裂滑移。由碳酸盐治愈。这样的洋内变形既可以归因于洋洋洋洋冲动所表达的俯冲构造，也可以归因于超压（？）转换断裂，或者更可能是沿着洋心复合体的脱离断裂滑移。