Calcium and copper isotope compositions in hydrothermally influenced sediments as proxies for hydrothermal activity on mid-ocean ridges: An example from the Carlsberg Ridge - Jian-Qiang Wang; Shuang-Shuang Lyu; Zhong-Yan Qiu; Xi-Qiu Han; Mou Li; Chun-Feng Li; Xue-Gang Chen (Chemical Geology, 2026)