Abstract Using high‐resolution remote sensing images and detailed field investigations, this study provides the spatiotemporal distribution geometry of Neoproterozoic giant mafic dyke swarm in southeastern Tarim Craton, which is crucial for reconstructing paleogeographic position Craton within Rodinia supercontinent. This extends over 600 km length 20 width, spanning more than 12,000 2 . Individual dykes ranged from 1.9 to 168 m thickness 27 2,778 length. The were emplaced at 933–914 Ma,...

Abstract With the large-scale construction of oil and gas pipelines, safety issues long-distance buried pipelines in service have become increasingly prominent. The complex geological topographical conditions special zone will put forwards extremely high requirements on pipe trench laying backfill materials technology. For example, are inevitable to cross active fault, while backfilled with soil has limitations protecting them from failure under fault displacement caused by earthquake....

The chilled marginal rocks of the Panzhihua layered intrusion Emeishan Large Igneous Province (ELIP), SW China, including microgabbros and olivine–phyric gabbros, are similar to coeval high-Ti basalts in area both major trace element compositions. gabbros characterized by depleted Nd isotopic compositions (εNd(t) = +1·15 +4·18) initial 87Sr/86Sr (0·7043–0·7052) those series associated basalts. have (0·7045 0·7054) but more enriched (εNd(t)=−1·49 +0·06), suggesting that magma was contaminated...

Abstract This study presents a complete trace element data set of chromite from the world’s largest podiform deposit at Kempirsai, Kazakhstan, together with platinum group (PGE) and Re-Os isotope compositions, to explore potential elements in deposits. Chromite orebodies Karaagash area Kempirsai Main ore field are hosted by dunites mantle sequence ophiolite. Dunites slightly distal composed olivine (forsterite content = 91.5–93.4) minor euhedral variable Cr# (0.73–0.83). These have primitive...

Abstract To understand the oxygen fugacity ( f O 2 ) during subduction initiation, we examined proto‐arc boninites and associated mantle peridotites from Troodos ophiolite, Cyprus. The ophiolite represents an exhumed piece of oceanic lithosphere that formed initiation in Neo‐Tethys Late Cretaceous. Dunites surrounding harzburgites Kokkinorotsos podiform chromite deposit were by reactions between ascending boninitic magmas. olivine‐chromite oxybarometers show values (∆QFM −0.41 ± 0.37)...

Abstract Petrology, geochemistry, platinum group elements (PGEs: Os, Ir, Ru, Rh, Pt, and Pd), Re‐Os isotope data of harzburgites plagioclase lherzolites from the Shuanggou ophiolite (southwest China) are presented in this study, order to determine whether ancient refertilization process can be preserved ophiolitic peridotites. The divided into two groups: (1) Group‐1 have 187 Os/ 188 Os ratios (0.12297–0.12727) PGE abundances similar those oceanic peridotites, thereby representing convecting...

In many large, layered, mafic-ultramafic intrusions worldwide cumulus apatite commonly occurs in the highly fractionated Fe-Ti oxide-rich lithological units at top of and associated plagioclase olivine, if present, have An content <50 mol% Fo <40 mol%. These are not true for several oxide ore-bearing mafic-mafic Emeishan large igneous province, SW China. A good example is Taihe intrusion, which described this paper. intrusion olivine significantly more primitive, containing 69 59 An,...

Abstract The Early Palaeozoic Shuanggou ophiolite is the best-preserved part of Ailaoshan belt. microgabbros (basaltic dykes) and basalts lavas) show distinct characteristics in geochemistry, implying that their genetic mechanisms are different. With Al 2 O 3 contents ranging from 14.7% to 17.0%, belong low-alumina type. They exhibit normal mid-ocean-ridge basalt (N-MORB) -like trace elemental with positive ε Nd ( t ) values (9.7–11.6) slightly variable 87 Sr/ 86 Sr) i ratios...

Abstract The Paleozoic Jinshajiang ophiolitic mélange in southwest China marks an important branch ocean (i.e., the Ocean) of Paleo-Tethys. Basic-intermediate rocks are widespread features mélange; their formation age is well known, but petrogenesis has not been studied, which means that evolutionary history Ocean constrained. To understand nature and ocean, we present a set elemental isotopic data from two typical crustal sequences areas mélange, Zhiyong Baimaxueshan. basalts ca. 343 Ma...

Abstract Boninites in many supra-subduction zone ophiolites are thought to mark the early stage of subduction. The Troodos ophiolite Cyprus contains a variety volcanic rocks including lower pillow lavas and boninite-bearing upper (UPL). Here we present major, trace element Pb isotope data for melt inclusions olivine from UPL on northern flank ophiolite. Melt hosted by high-Mg (Fo = 89.4–93.5) grains have typical high-Ca boninitic compositions with high MgO (11.2–18.4 wt%) SiO2 (51.2–55.0 low...

Abstract Seismic fault displacement is the main factor leading to local buckling failure of buried pipeline, especially crossing oblique-reverse fault. The behavior pipeline complex under 3-D In this work, pipe mechanism was discussed, then a shell and solid element nonlinear contact coupling model established based on ABAQUS program. (potential locations, developing process) systematically analyzed, comparing against same single displacement. Subsequently, influence internal pressure,...

Platinum group elements (PGE) and Re–Os isotopes of mantle peridotites in the Jinshajiang ophiolite (SW China) were investigated this study, order to constrain evolution lithospheric beneath Jinshajiang-Ailaoshan Ocean, which was a branch eastern Paleo-Tethys. The have whole-rock compositions (e.g., MgO = 32.7–38.1 wt.%; Al2O3 0.67–1.30 wt.%) spinels with moderate Cr# values (0.4–0.6) similar those abyssal peridotites, indicate degrees partial melting (15%–20%). These exhibit U-shaped...

Abstract Platinum‐group elements (PGE) in PGE‐rich porphyry copper (gold) deposits are mainly Pt and Pd, whereas the concentrations of other PGE (Ru, Rh, Os, Ir) significantly low. Moreover, Pd exist sulfides forms crystal lattice or tiny platinum‐group mineral (PGM) inclusions. The present data show that there is a positive relationship between Cu (Au) deposits. comparison chondrite‐normalized distribution patterns ore‐bearing intrusions ore‐barren arc setting, 187 Os/ 188 87 Sr/ 86 Sr S...

Abstract Oil and gas pipelines that go through an active normal fault often deform largely cause serious disasters. On the basis of beam theory elastic foundation assuming a shape function for deformed pipeline, new analytical method is proposed to calculate pipeline strain under fault. The length calculated by using simplified structural mechanical model. Moreover, three‐dimensional solid finite element model (3D FEM) developed different working conditions. solution numerical results 3D FEM...

The deformation law of pipelines crossing landslide areas is an important prerequisite for the scientific design pipelines. Most current studies find it difficult to simulate real stress and strain state on site. This study conducted two centrifuge model tests observe pipeline failure indicators (deformation, stress, strain) slope (crack width, soil pressure, displacement) in response changes acceleration. experimental findings align with results obtained from numerical simulations. indicate...