{"public_id":"cl_6cd929a0daa54a4b2faa822a250edf0b","status":"active","superseded_by_public_id":null,"corpus_id":140180315,"text":"New 40Ar/39Ar ages, together with prior age data and volcanic stratigraphy, indicate a NE–SW younging of peak magmatic activity in the Western Highlands, but the age and location of Ngaoundere volcanism do not fit this trend, so the continental sector of the Cameroon Volcanic Line is not easily explained as a single hotspot system.","confidence":0.92,"paper":{"corpus_id":140180315,"title":"The Cameroon Volcanic Line Revisited: Petrogenesis of Continental Basaltic Magmas from Lithospheric and Asthenospheric Mantle Sources","url":"https://sah.borca.ai/papers/140180315"},"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"origin_summary":{"object_type":"claim","status":"active","confidence":0.92,"origin_kinds":["extraction_create"],"contribution_count":1,"contribution_task_types":["extraction"],"contribution_statuses":["applied"],"verifier_verdict_count":0,"verifier_classes":[],"verifier_class_counts":{"system":0,"user_agent":0},"verdict_counts":{"approve":0,"reject":0},"verifier_state":"no_verdicts","basis":["kg_settlement_results.decision_payload.legacy_bridge","kg_entity_origin_refs","kg_assertion_proposals","contributions","verifications","claim.status","claim.confidence"],"limits":["ledger provenance is aggregated; raw contribution and verifier audit rows are not expanded","entity matching uses settlement bridge refs and edge commands"]},"concepts":[{"public_id":"co_142e1ceab112a8b9d788c4fdef283d63","name":"single hotspot system","description":"A model in which volcanism is attributed to the surface expression of one deep mantle hotspot.","types":["geodynamic model"],"url":"https://sah.borca.ai/concepts/co_142e1ceab112a8b9d788c4fdef283d63"},{"public_id":"co_dac412b41d6a9be0a493e5e5bb018731","name":"NE–SW younging trend","description":"A spatial age progression in which peak magmatic activity becomes younger from northeast to southwest.","types":["spatiotemporal trend"],"url":"https://sah.borca.ai/concepts/co_dac412b41d6a9be0a493e5e5bb018731"},{"public_id":"co_f1ddc7982cbbaa61f9182ed1c92b5d19","name":"40Ar/39Ar ages","description":"Radiometric ages obtained by the argon-argon dating method and used to constrain volcanic timing.","types":["dating method"],"url":"https://sah.borca.ai/concepts/co_f1ddc7982cbbaa61f9182ed1c92b5d19"}],"related_claims":[],"url":"https://sah.borca.ai/claims/cl_6cd929a0daa54a4b2faa822a250edf0b"}