start-ver=1.4 cd-journal=joma no-vol=53 cd-vols= no-issue=2 article-no= start-page=e2025GL118147 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2026 dt-pub=20260113 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Davemaoite Elasticity Reveals Slab‐Induced Heterogeneity in the Mantle Transition Zone en-subtitle= kn-subtitle= en-abstract= kn-abstract=The observed 2%–7% low-shear velocity (VS) anomalies near the subducted slab at the bottom mantle transition zone (MTZ) indicate strong lateral heterogeneity, which is commonly attributed to subducted oceanic crust. However, davemaoite, a major constituent of the subducted oceanic crust, has been poorly constrained in its elasticity, hindering accurate velocity modeling and obscuring the origin of these low-velocity features. Here we report single-crystal elasticity of Ti-bearing davemaoite with the composition of Ca(Si0.57Ti0.43)O3 under high pressure-temperature and found that Ti incorporation significantly reduces velocities and alters the pressure dependence of the shear modulus. Further velocity modeling demonstrated that subducted crusts with varying Ti content have seismic signatures of 1.7(2)–6.8(5)% low-VS at the bottom MTZ, consistent with the observed low-VS structure in the region. These findings highlight the role of slab-derived chemical heterogeneity in generating mantle seismic anomalies and provide new experimental constraints on the structure and dynamics of the deep Earth. en-copyright= kn-copyright= en-aut-name=YuYingxin en-aut-sei=Yu en-aut-mei=Yingxin kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ZhangXinyue en-aut-sei=Zhang en-aut-mei=Xinyue kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=ZhangDongzhou en-aut-sei=Zhang en-aut-mei=Dongzhou kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=LiLuo en-aut-sei=Li en-aut-mei=Luo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=MaoZhu en-aut-sei=Mao en-aut-mei=Zhu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=SunNingyu en-aut-sei=Sun en-aut-mei=Ningyu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=WangDenglei en-aut-sei=Wang en-aut-mei=Denglei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=LiJing en-aut-sei=Li en-aut-mei=Jing kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=ZhaoChaoshuai en-aut-sei=Zhao en-aut-mei=Chaoshuai kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=QianCheng en-aut-sei=Qian en-aut-mei=Cheng kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=WeiYingzhan en-aut-sei=Wei en-aut-mei=Yingzhan kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=LiXinyang en-aut-sei=Li en-aut-mei=Xinyang kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= en-aut-name=WangYuzhu en-aut-sei=Wang en-aut-mei=Yuzhu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=13 ORCID= en-aut-name=IshiiTakayuki en-aut-sei=Ishii en-aut-mei=Takayuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=14 ORCID= affil-num=1 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=2 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=3 en-affil=GeoSoilEnviroCARS, University of Chicago kn-affil= affil-num=4 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=5 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=6 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=7 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=8 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=9 en-affil=State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China kn-affil= affil-num=10 en-affil=State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences kn-affil= affil-num=11 en-affil=State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University kn-affil= affil-num=12 en-affil=State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University kn-affil= affil-num=13 en-affil=Shanghai Advanced Research Institute, Chinese Academy of Sciences kn-affil= affil-num=14 en-affil=Institute for Planetary Materials, Okayama University kn-affil= en-keyword=Ti-bearing davemaoite kn-keyword=Ti-bearing davemaoite en-keyword=single-crystal elasticity kn-keyword=single-crystal elasticity en-keyword=slab-induced heterogeneity kn-keyword=slab-induced heterogeneity en-keyword=mantle transition zone kn-keyword=mantle transition zone END