The opening of the Southwest Sub-basin (SWSB) of the South China Sea was slow-spreading and has been propagated toward the southwest. Yet, the structural variability and magmatic accretion process of the SWSB are still enigmatic. Here, utilizing a wide-angle seismic profile traversing the central segment of the SWSB, we obtain detailed S-wave velocity and V-p/V-s ratio models to investigate oceanic accretion process. In the first stage of seafloor spreading (ages >19.2 Ma), the V-p/V-s in the northern conjugate flank is more variable, while the V-p/V-s in the southern flank is lower and more convergence, with V-p and V-s decreased, indicating more vigorous magmatism on the northern flank but more thick cracks developed on the southern flank. In the second stage of spreading (ages similar to 19.2-17 Ma), V-p/V-s ratios in different conjugated flanks indicate pronounced asymmetry in oceanic lithospheric structure. The V-p/V-s ratios in the southern flank reveal a partially serpentinized mantle overlain by possible continental fragments embedded in basaltic rocks, contrasting to the normal oceanic crust in the north. Our results suggest that magmatic budget in the SWSB during seafloor spreading was asymmetric and consistently stronger in the north flank of the spreading axis, which probably associated with a southward ridge jump event. The high V-p/V-s ratios at the extinct spreading center reveal the serpentinization beneath both flanks of the median valley. After the cessation of seafloor spreading, the tectonic extension of the frozen magma chamber formed a median valley composed of highly fractured mafic rocks overlain by remnant continental fragments.
Following the end-Permian mass extinction, temperatures remained elevated for similar to 5 Myr, suggesting a fundamental restructuring of the Earth's climate system. Both a weak silicate weathering feedback and CO2 release from enhanced marine authigenic clay precipitation are proposed to have sustained elevated temperatures during the Early Triassic. The lithium isotope (delta Li-7) proxy can reveal the roles of terrestrial and marine reverse weathering in maintaining elevated Early Triassic temperatures. We present the first delta Li-7 values from Upper Permian to Middle Triassic carbonate strata from the Panthalassa Ocean and the western Tethys Ocean. At the Permian/Triassic boundary, carbonate delta Li-7 values in these records, along with previously published data from the eastern Tethys, are consistently below 0 parts per thousand, and remain low in the Early Triassic. Differences in carbonate delta Li-7 values among sections are interpreted as the combined influence of diagenetic alteration and carbonate mineralogy on the isotopic fractionation from co-eval seawater. In the Early Triassic, we observe a large difference between carbonate delta Li-7 values and published siliciclastic records following the extinction. Even after accounting for carbonate diagenesis, these paired records imply Li isotope fractionation between carbonate minerals, authigenic marine clay, and seawater that are distinct from modern marine environments. Inferred minimum and maximum constraints on seawater delta Li-7 values from these Early Triassic records are also incompatible. We hypothesize that a reduced oceanic Li reservoir-and thus, short residence time-may account for the anomalous Early Triassic delta Li-7 records, implying a simultaneous increase in continental weathering and marine clay authigenesis. Heterogeneous seawater delta Li-7 records in the Early Triassic could be, therefore, a potential symptom of perturbed carbon-silica cycling that permitted elevated temperatures to persist far longer than the typical timescale for the silicate weathering feedback on Earth's climate.
Abstract The late Eocene to early Oligocene is an intriguing Paleogene period in which the Earth climate state changed from Warmhouse to Coolhouse. Accurate age models are essential for investigating these climate transitions. The southwestern Pacific International Ocean Discovery Program (IODP) Site U1553, with its almost complete succession of the latest Eocene to early Oligocene, provides a rare opportunity to explore the Paleogene climate shifts at high southern latitude. Here we report on paleomagnetic results from ∼600 paleomagnetic samples collected throughout the manganous, ferruginous and sulfidic zones at 5–260 m sediment depth. We identify fine‐grained titanomagnetite as the primary remanence carrier through rock magnetic analyses, including electron microscopy, isothermal remanent magnetization unmixing and endmember modeling, low‐temperature cycling, and first‐order reversal curves. We find that high carbonate dilution rather than the previously proposed reductive dissolution is the main cause of low ferrimagnetic mineral content and thus very weak natural magnetization. Reductive diagenesis and precipitation of secondary iron sulfide minerals also perceivably affect paleomagnetic recording quality. Thanks to an extensive sample set, sensitive SQUID magnetometry, and rigorous data evaluation, we were nonetheless able to identify 15 geomagnetic reversals. Supported by micropaleontology data, these could be confidently correlated with Chrons C16–C8r of the geomagnetic polarity time scale. Our Paleogene magnetostratigraphy can be used as a chronological anchor for future climate studies. We also discussed the long‐term paleomagnetic consequences of mild reductive diagenesis in the suboxic and sulfidic zones and identified detrital titanomagnetite as the most alteration‐resistant magnetic carrier mineral.
Academic Summary As firms navigate dynamic technological, market, and institutional environments, adaptability-and related notions such as flexibility and agility-have become central to innovation management. Yet, the literature is conceptually fragmented: multiple labels are applied with overlapping but inconsistent content, and few studies assess whether differing conceptualizations yield distinct predictions for innovation outcomes. Drawing on a dynamic capability lens, we synthesize prior research and define adaptability as an organizational capability grounded in the flexibility of abilities, resources, and processes that can, but need not, be paired with reactivity, proactivity, and/or speed to address shifting internal and external conditions. A multi-level meta-analysis of 549 effect sizes from 268 independent samples reveals an overall positive relationship between adaptability and innovation. Moreover, the meta-analytical approach supports the configural structure of adaptability: the adaptability-innovation relationship is most pronounced when all attributes of adaptability (flexibility, reactivity, proactivity, and speed) are present. Furthermore, the relationship is stronger for non-incremental than for incremental innovation, for larger firms, and in unstable institutional environments. By synthesizing the fragmented literature on adaptability, we provide a coherent, testable conceptualization of adaptability and explain why its impact on innovation appears generally positive yet heterogeneous across studies.Managerial Summary Adaptability is an important organizational capability connected to innovation. However, what exactly adaptability is, remains unclear, especially since related terms, such as flexibility or agility, are sometimes used interchangeably. We quantitatively aggregate evidence from a large body of prior research and find a clear pattern: flexibility, that is the capability to change, is the foundation. However, innovation is highest when flexibility is paired with three additional capabilities: (1) sense-and-respond to external change (reactivity), (2) anticipate and shape emerging opportunities (proactivity), and (3) move quickly (speed). Organizations that combine all these elements consistently innovate more. This advantage is largest for non-incremental innovation (e.g., new business models, new-to-the-firm offerings, major technology shifts), in large firms (where inertia is common), and in institutionally unstable environments (where rules and conditions change abruptly). Managers should not treat adaptability, flexibility, or agility as a slogan: Instead, they should build flexibility first, and then improve routines for early sensing, proactivity, and fast decision-making.
: With increasing political polarization accompanied by various economic threats and crises, the interplay of politics and work is crucial to understanding emerging phenomena. With this position paper, we highlight what work and organizational psychology can offer in the work-politics nexus. We classify three broad streams in which we see the need for more research on the work-politics nexus: (a) politics affecting work, (b) work affecting political attitudes and engagement, and (c) political participation at work. Using these areas, we highlight the urgency for organizations and practitioners to pay attention and provide future research directions for work and organizational psychology scholars. This position paper aims to highlight initial work and organizational psychological research in the work-politics nexus and encourages work and organizational psychologists to direct more attention toward the intersection of work and the broader civic sphere. Zusammenfassung: Angesichts der zunehmenden politischen Polarisierung, begleitet von verschiedenen wirtschaftlichen Bedrohungen und Krisen, ist das Zusammenspiel von Politik und Arbeit entscheidend f & uuml;r das Verst & auml;ndnis neu auftretender Ph & auml;nomene. Mit diesem Positionspapier heben wir hervor, was die Arbeits- und Organisationspsychologie im Zusammenhang zwischen Arbeit und Politik leisten kann. Wir unterscheiden drei gro ss e Bereiche, in denen wir einen Forschungsbedarf zum Zusammenhang zwischen Arbeit und Politik sehen: (a) Politik, die sich auf die Arbeit auswirkt, (b) Arbeit, die sich auf die Politik auswirkt, und (c) politische Partizipation am Arbeitsplatz. Anhand dieser Bereiche betonen wir die Dringlichkeit f & uuml;r Organisationen, diesem Thema Aufmerksamkeit zu schenken, und geben zuk & uuml;nftige Forschungsrichtungen f & uuml;r Wissenschaftler und Wissenschaftlerinnen der Arbeits- und Organisationspsychologie vor. Dieses Positionspapier soll erste arbeits- und organisationspsychologische Forschungsarbeiten im Zusammenhang zwischen Arbeit und Politik hervorheben und Arbeits- und Organisationspsychologen und -psychologinnen dazu ermutigen, mehr Aufmerksamkeit auf die Schnittstelle zwischen Arbeit und dem breiteren zivilgesellschaftlichen Bereich zu richten.
