Water (hydrogen) is crucial to the geochemical and dynamic evolution of Earth by modulating a variety Earth’s interior properties processes, which govern differentiation, plate tectonics, volcanism. addition also expected promote thinning removal lithosphere roots, as water can markedly decrease viscosity lithospheric mantle. While source deep controversial, recent evidence suggests that possible reservoir for volatiles mantle transition zone (MTZ) be sampled at mid-ocean rift system....

This study provides a method for measuring Pb isotopes of olivine-hosted melt inclusions with diameters larger than 40 micrometers.

Orbital period changes of eight W-type contact binaries (TY Boo, BH Cas, AD Cnc, TX RZ Com, LS Del, BB Peg and AA UMa) are presented based on the analysis their O–C curves. It is found that periods five systems TY Del UMa show secular increase. For Peg, its increase rate has been revised. weak evidence also shows orbital increasing. remaining three times light minimum given by Agerer & Hubscher indicate that, recently, However, properties need further study. The mass ratios all larger than...

No significant crystal orientation effect during SIMS sulfur isotope analysis of marcasite.

Abstract At mid‐ocean ridges, volcanic activity is predominantly marked by the voluminous effusion of tholeiitic basaltic lavas, with sporadic occurrences mildly alkalic basalts. However, genetic link between basalts and small‐volume alkali remains enigmatic. We report both alkaline volcanism at Marion Rise segment ultraslow spreading (14 mm/yr) Southwest Indian Ridge (SWIR). In contrast to effusive (MORB) in Dr 27 along Rise, 30 samples consist transitional glass scoria E‐MORB‐like affinity...

<p>Details of the study’s sample information, analytical methods, data, and data plots.</p>

<p>Details of the study’s sample information, analytical methods, data, and data plots.</p>

Upper mantle heterogeneity is the consequence of differentiation throughout Earth’s history, driven by material transportation within upper and across planet’s surface to lower mantle. The resulting heterogenic domains likely evolved through time, reflecting dynamic evolution in deep time. Previous studies mainly relied on present-day basalts (e.g., MORB OIB) understand O’Nions et al., 1980; Stracke 2005, 2022; Yang 2021). However, spatiotemporal ancient remains...

Abstract Olivine‐hosted melt inclusions have the potential to provide direct evidence about nature of mantle sources magmas. In this study, we report major and trace element Sr–Nd–Pb–Hf isotope compositions Lijiang picrites from Emeishan large igneous province, as well Pb isotopic olivine‐hosted in picrites. Using these data, infer for high‐Ti (Ti/Y = 645–654), compare them with Dali low‐Ti 351–408). highly heterogeneous ( 208 Pb/ 206 2.015–2.201, 207 0.812–0.882, 260 Ma age‐corrected) that...

A detailed analysis of orbital period changes seven near-contact binary stars (NCBs) (BL And, V473 Cas, XZ CMi, BV Eri, RU UU Lyn and GR Tau) with less than 1 d has been performed their respective O–C diagrams are formed discussed. It is found that all systems analysed show secular decreasing. For the change was based on data collected by Moschner, Frank & Bastian. its shows some complex changes, a possible cyclic oscillation discovered to superpose decrease can be explained either presence...

Abstract The North China Craton (NCC) is believed to be the best example of cratonic destruction. However, processes leading destruction remain unclear, largely due a lack knowledge nature Mesozoic NCC lithospheric mantle. Here we report new petrological and geochemical data for Early Cretaceous basalts, which provide insights into underlying basalts (all tholeiites) show limited variation in composition. In contrast, olivine‐hosted melt inclusions from these display wide range compositional...

Abstract The tectonic history of the Philippine Sea plate is an essential piece in understanding evolution Southeast Asia, but it still unclear and controversial. We present first geochemical data obtained from lavas Gagua Ridge (GR) within Sea. GR exhibit signatures typical subduction-related arc magmatism. Plagioclase Ar-Ar ages ca. 124–123 Ma support formation vicinity during Early Cretaceous induced by subduction oceanic along East Asia. trapped zircon xenocrysts cluster at 250 Ma, 0.75...

Detrital zircon U-Pb dating is a powerful tool to trace sources for sedimentary basin and understand of geological history in structurally complex areas. This study established an analytical protocol measurement detrital age by LA-MC-ICP-MS. Because zircons normally have large Pb content variation (several ppm hundred ppm), which leads variations signal intensity, two sets detector arrays were used. For Pb-rich zircons, 206Pb was collected with Faraday cup array, while Pb-poor ion counter...

Abstract Delineation of geochemically distinct domains in Earth’s mantle is essential for understanding large-scale convective flow and dynamics. Previous studies identify possible long-lived (>60 million-year) isotopic (i.e. Antarctic-Zealandia, Pacific Indian) near the Philippine Sea western Pacific. Here we compile published basalt geochemistry surroundings add new Mo water content data Gagua Ridge lavas, northwestern Sea, to distinguish slab-derived components during subduction. The...

Abstract Basaltic lavas sample recycled crustal materials from their mantle source. Constraining the location and residence time of these in is critical to understand global dynamics. In this study, we present new whole‐rock major trace element abundances, Sr‐Nd‐Mo‐Os isotopes, water contents He isotopes volcanic glasses, U‐Pb ages zircons, compositions melt inclusions, spinels olivines South China Sea (SCS) seamounts lavas. These data are compared with literature intraplate volcanism...

Abstract Picrites are potentially near‐primary melts that offer rare insights into the earliest stages of magmatic evolution. However, without detailed investigation processes, robust records early melt evolution and mantle melting behavior cannot be acquired. Here petrological geochemical interrogations Dali picrites were conducted to investigate processes. Compositional variation observed in is dominated by variable accumulation a wehrlitic assemblage, transported low MgO carrier melt....

Apatite, a common REE-enriched accessory mineral occurring in various rocks, provides important information on metallogenic source, magma evolution and source of sedimentary basin. In this study, we described an situ method for simultaneous measurement REE concentrations Nd isotopic composition apatite using single-collector sector field inductively coupled plasma mass spectrometer muti-collector spectrometer, connected to single 193 nm laser-ablation system. The laser-ablated aerosol was...