Fairfax County School Superintendent Linton Deck last night accepted a school board offer to remain at the helm of the Washington area's largest school system for four more years at an annual salary of at least $64,000.

Deck came to Fairfax from Orange County, Fla., a year ago to serve the last 18 months of a four-year term left vacant when Superintendent S. John Davis left the county to become Virginia's state superintendent of schools.

The school board is expected to increase Deck's $64,000 salary before his new contract goes into effect on July 1.

In other business last night, the board voted unanimously to close the Cedar Lane Elementary School in Vienna at the end of this school year. The closing came at the request of parents in Vienna who wished to avoid a school-closing study that was scheduled for their community. Such studies in the past have often generated considerable acrimony. Cedar Lane students will attend nearby Cunningham Park Elementary next year.

Last night's action on the Cedar Lane request coupled with a closing agreed on last month after a similar request from parents in the Tysons Corner area will eliminate all school board plans to study school closings this winter.

Board members praised parents present at last night's meeting for making the closing request. "We think you have acted very responsibly and in the best interests of the children at both schools," said Board Chairman Ann P. Kahn.