Photo: Contra Costa County Sheriff

A 54-year-old Orinda teacher was arrested and charged with sex crimes in connection to inappropriate and unlawful relationships with two minors while she was a teacher at a Lafayette school more than two decades ago, authorities said Thursday.

Contra Costa County Sheriff’s detectives arrested Kyle Ann Wood around 6:30 p.m. Wednesday at her Pleasant Hill home following a recent probe by the sheriff’s investigation division and Lafayette police into the alleged misconduct, officials said. The victims were two of Wood’s students at Acalanes High School, and the alleged relationships occurred between 1996 and 1998.

Authorities booked Wood, who is currently a teacher at Miramonte High School in Orinda, into the Martinez Detention Facility and held her on $150,000 bail, according to the Sheriff’s Office. Prosecutors filed felony sex charges against Wood.

Wood was placed on administrative leave, Superintendent John Nickerson said in a Thursday statement. She has taught in the Acalanes Union High School District since 1994.

“We hold student well-being as our greatest priority, and whenever we hear about situations that are counter to this value, it is of the greatest concern,” Nickerson said. “I assure you that our District office will cooperate fully with law enforcement in this ongoing investigation.”

Nickerson reminded district employees that their conduct with students should be respectful, and instructed students to report concerns about inappropriate conduct to a trusted adult.

The investigation continues. Anyone with information about the case can call detectives at 925-283-3680.

Alejandro Serrano is a San Francisco Chronicle staff writer. Email: alejandro.serrano@sfchronicle.com Twitter: @serrano_alej